Strings
Descrition del contenete del págine
Conversion de Strings a pluri lingues de programation.
Ti-ci programa esset convertet a 20 lingues de programation.
Originale
Origin of strings.bas:
Example included in Vintage BASIC 1.0.3.
http://vintage-basic.net/
10 INPUT"ENTER A STRING";A$
20 INPUT"ENTER A NUMBER";N
30 ?"ASC(A$)=";ASC(A$)
40 ?"CHR$(N)=";CHR$(N)
50 ?"LEFT$(A$,N)=";LEFT$(A$,N)
60 ?"MID$(A$,N)=";MID$(A$,N)
70 ?"MID$(A$,N,3)=";MID$(A$,N,3)
80 ?"RIGHT$(A$,N)=";RIGHT$(A$,N)
90 ?"LEN(A$)=";LEN(A$)
100 ?"VAL(A$)=";VAL(A$)
110 ?"STR$(N)=";STR$(N)
120 ?"SPC(N)='";SPC(N);"'"
In Arturo
; Strings
; Original version in BASIC:
; Example included in Vintage BASIC 1.0.3.
; http://www.vintage-basic.net
; This version in Arturo:
; Copyright (c) 2023, Marcos Cruz (programandala.net)
; SPDX-License-Identifier: Fair
;
; Written on 2023-10-18.
;
; Last modified: 20251205T0053+0100.
space: " "
s: input "Enter a string: "
until [
dup try? [
n: to :integer input "Enter an integer: "
]
else [print "Integer expected. Retry."]
][]
print ""
prints ~"ASC(\"|s|\") --> "
prints ~"to :integer first \"|s|\" --> "
print to :integer first s
prints ~"CHR$(|n|) --> "
prints ~"to :string to :char |n| --> "
print to :string to :char n
prints ~"LEFT$(\"|s|\", |n|) --> "
prints ~"slice \"|s|\" 0 min range sub |n| 1 sub size \"|s|\" 1 --> "
print ~"\"|slice s 0 min range sub n 1 sub size s 1|\""
prints ~"MID$(\"|s|\", |n|) --> "
prints ~"slice \"|s|\" min range sub |n| 1 sub size \"|s|\" 1 sub size \"|s|\" 1 --> "
print ~"\"|slice s min range sub n 1 sub size s 1 sub size s 1|\""
prints ~"MID$(\"|s|\", |n|, 3) --> "
prints ~"slice \"s\" min range sub |n| 1 sub size \"|s|\" 1 min range add sub |n| 1 sub 3 1 sub size \"|s|\" 1 --> "
print ~"\"|slice s min range sub n 1 sub size s 1 min range add sub n 1 sub 3 1 sub size s 1|\""
prints ~"RIGHT$(\"|s|\", |n|) --> "
prints ~"slice \"|s|\" max range 0 sub size \"|s|\" |n| sub size \"|s|\" 1 --> "
print ~"\"|slice s max range 0 sub size s n sub size s 1|\""
prints ~"LEN(\"|s|\") --> "
prints ~"size \"|s|\" --> "
print size s
prints ~"VAL(\"|s|\") --> "
prints ~"if? numeric? \"|s|\" [to :floating \"|s|\"] else [0] --> "
print [ if? numeric? s [to :floating s] else [0] ]
prints ~"STR$(|n|) --> "
prints ~"to :string |n| --> "
print ~"\"|to :string n|\""
prints ~"SPC(|n|) --> "
prints ~"repeat \" \" |n| --> "
print ~"\"|repeat space n|\""
In C#
// Strings
// Original version in BASIC:
// Example included in Vintage BASIC 1.0.3.
// http://www.vintage-basic.net
// This version in C#:
// Copyright (c) 2024, Marcos Cruz (programandala.net)
// SPDX-License-Identifier: Fair
//
// Written in 2024-12-21/25.
//
// Last modified: 20251205T1549+0100.
using System;
class vintageBasicStrings
{
static string GetString(string prompt)
{
Console.Write(prompt);
return Console.ReadLine();
}
static int GetInteger(string prompt)
{
int n = 0;
while (true)
{
try
{
n = Int32.Parse(GetString(prompt));
break;
}
catch
{
}
}
return n;
}
static void Main()
{
string s = GetString("Enter a string: ");
int n = GetInteger("Enter an integer: ");
Console.WriteLine();
Console.Write($"ASC(\"{s}\") --> ");
Console.Write($"(int) \"{s}\"[0] --> ");
Console.WriteLine((int) s[0]);
Console.Write($"CHR$({n}) --> ");
Console.Write($"(char) ({n}) --> ");
Console.WriteLine("'" + (char) n + "'");
Console.Write($"LEFT$(\"{s}\", {n}) --> ");
Console.Write($"\"{s}\".Substring(0, Math.Min({n}, \"{s}\".Length) --> ");
Console.WriteLine("\"" + s.Substring(0, Math.Min(n, s.Length)) + "\"");
Console.Write($"MID$(\"{s}\", {n}) --> ");
Console.Write($"{n} > \"{s}\".Length ? \"\" : \"{s}\".Substring({n} - 1) --> ");
Console.WriteLine("\"" + (n > s.Length ? "" : s.Substring(n - 1)) + "\"");
Console.Write($"MID$(\"{s}\", {n}, 3) --> ");
Console.Write($"{n} > \"{s}\".Length ? \"\" : \"{s}\".Substring({n} - 1, Math.Min(3, \"{s}\".Length - {n} + 1)) --> ");
Console.WriteLine("\"" + (n > s.Length ? "" : s.Substring(n - 1, Math.Min(3, s.Length - n + 1)) + "\""));
Console.Write($"RIGHT$(\"{s}\", {n}) --> ");
Console.Write($"\"{s}\".Substring(Math.Max(0, \"{s}\".Length - {n}) --> ");
Console.WriteLine("\"" + s.Substring(Math.Max(0, s.Length - n)) + "\"");
Console.Write($"LEN(\"{s}\") --> ");
Console.Write($"\"{s}\".Length --> ");
Console.WriteLine(s.Length);
Console.Write($"VAL(\"{s}\") --> ");
int v;
try{ v = Int32.Parse(s); } catch { v = 0; };
Console.WriteLine($"int v; try{{ v = Int32.Parse(\"{s}\"); }} catch {{ v = 0; }} --> {v}");
Console.Write($"STR$({n}) --> ");
Console.Write($"Convert.ToString({n}) --> ");
Console.WriteLine("\"" + Convert.ToString(n) + "\"");
Console.Write($"SPC({n}) --> ");
Console.Write($"new string(' ', {n}) --> ");
Console.WriteLine("\"" + new string(' ', n) + "\"");
}
}
In Chapel
// Strings
// Original version in BASIC:
// Example included in Vintage BASIC 1.0.3.
// http://www.vintage-basic.net
// This version in Chapel:
// Copyright (c) 2025, Marcos Cruz (programandala.net)
// SPDX-License-Identifier: Fair
//
// Written on 2025-04-06.
//
// Last modified: 20250407T1346+0200.
import IO;
proc acceptString(prompt: string): string {
write(prompt);
IO.stdout.flush();
return IO.readLine().strip();
}
proc acceptValidInteger(prompt: string): int {
var result: int;
while true {
var s: string = acceptString(prompt);
try {
result = (s): int;
break;
}
catch exc {
writeln("Integer expected.");
}
}
return result;
}
proc main() {
var s: string = acceptString("Enter a string: ");
var n: int = acceptValidInteger("Enter an integer: ");
writef(
'ASC("%s") --> "%s"[0].toCodepoint() --> %i\n',
s, s, s[0].toCodepoint()
);
writef(
'CHR$(%i) --> codepointToString(%i: int(32)) --> "%s"\n',
n, n, codepointToString(n: int(32))
);
writef(
'LEFT$("%s", %i) --> "%s"[0 .. min(%i - 1, "%s".size - 1)] --> "%s"\n',
s, n, s, n, s, s[0 .. min(n - 1, s.size - 1)]
);
writef(
'MID$("%s", %i) --> "%s"[%i - 1 ..] --> "%s"\n',
s, n, s, n, s[n - 1 ..]
);
writef(
'MID$("%s", %i, 3) --> "%s"[%i - 1 .. min(%i - 1 + 3 - 1, "%s".size - 1)] --> "%s"\n',
s, n, s, n, n, s, s[n - 1 .. min(n - 1 + 3 - 1, s.size - 1)]
);
writef(
'RIGHT$("%s", %i) --> "%s"[max(0, "%s".size - %i) .. "%s".size - 1] --> "%s"\n',
s, n, s, s, n, s, s[max(0, s.size - n) .. s.size - 1]
);
writef(
'LEN("%s") --> "%s".size --> %i\n',
s, s, s.size
);
var sToReal: real;
try {
sToReal = s: real;
writef(
'VAL("%s") --> "%s": real --> %r\n',
s, s, sToReal
);
}
catch ext {
writef(
'VAL("%s") --> "%s": real /* error catched by `catch` */ --> %r\n',
s, s, sToReal
);
}
writef(
'STR$(%i) --> %i: string --> "%s"\n',
n,n, n: string
);
writef(
'SPC(%i) --> " " * %i --> "%s"',
n, n, " " * n
);
}
In Crystal
# Strings
# Original version in BASIC:
# Example included in Vintage BASIC 1.0.3.
# http://www.vintage-basic.net
# This version in Crystal:
# Copyright (c) 2023, Marcos Cruz (programandala.net)
# SPDX-License-Identifier: Fair
#
# Written in 2023-09.
#
# Last modified: 20241226T0148+0100.
def get_integer : Int
while true
print "Enter an integer: "
begin
return gets.not_nil!.to_i
break
rescue
puts "That wasn't a valid integer."
end
end
end
print "Enter a string: "
s = gets.not_nil!
n = get_integer
print "ASC(\"#{s}\") --> "
print "\"#{s}\".[0].ord --> "
print s.[0].ord, "\n"
print "CHR$(#{n}) --> "
print "#{n}.chr --> "
print "'", n.chr, "'\n"
print "LEFT$(\"#{s}\", #{n}) --> "
print "\"#{s}\".[0...#{n}] --> "
print "\"", s.[0...n], "\"\n"
print "MID$(\"#{s}\", #{n}) --> "
print "\"s\".[#{n} - 1..] --> "
print "\"", s.[n - 1..], "\"\n"
print "MID$(\"#{s}\", #{n}, 3) --> "
print "\"s\".[(#{n} - 1)...(#{n} - 1 + 3)] --> "
print "\"", s.[(n - 1)...(n - 1 + 3)], "\"\n"
print "RIGHT$(\"#{s}\", #{n}) --> "
print "\"s\".[#{-n}..] --> "
print "\"", s.[-n..], "\"\n"
print "LEN(\"#{s}\") --> "
print "\"#{s}\".size --> "
print s.size, "\n"
print "VAL(\"#{s}\") --> "
print "(\"#{s}\".to_f rescue 0.0) --> "
print (s.to_f rescue 0.0), "\n"
print "STR$(#{n}) --> "
print "#{n}.to_s --> "
print "\"#{n.to_s}\"\n"
print "SPC(#{n}) --> "
print " \" \" * #{n} --> "
print "\"", (" " * n), "\"\n"
In D
// Strings
// Original version in BASIC:
// Example included in Vintage BASIC 1.0.3.
// http://www.vintage-basic.net
// This version in D:
// Copyright (c) 2025, Marcos Cruz (programandala.net)
// SPDX-License-Identifier: Fair
//
// Written in 2025-03-22/23.
//
// Last modified: 20251220T0653+0100.
module strings;
string acceptString(string prompt)
{
import std.stdio : readln;
import std.stdio : write;
import std.string : strip;
write(prompt);
return strip(readln());
}
int acceptValidInteger(string prompt)
{
import std.conv : to;
import std.stdio : writeln;
int result;
while (true)
{
string s = acceptString(prompt);
try
{
result = to!int(s);
break;
}
catch (Exception exc)
{
writeln("Integer expected.");
}
}
return result;
}
void main()
{
import std.array : replicate;
import std.conv : to;
import std.range : repeat;
import std.stdio : writefln;
string s = acceptString("Enter a string: ");
int n = acceptValidInteger("Enter an integer: ");
writefln("ASC(\"%1$s\") --> to!(int)(\"%1$s\"[0]) --> %2$d", s, to!(int)(s[0]));
writefln("CHR$(%1$d) --> to!char(%1$d) --> \"%2$s\"", n, to!char(n));
writefln("LEFT$(\"%1$s\", %2$d) --> \"%1$s\"[0 .. %2$d] --> \"%3$s\"", s, n, s[0 .. n]); // XXX TODO utf-8
writefln("MID$(\"%1$s\", %2$d) --> \"%1$s\"[%2$d - 1 .. \"%1$s\".length] --> \"%3$s\"", s, n, s[n - 1 .. s.length]); // XXX TODO utf-8
writefln("MID$(\"%1$s\", %2$d, 3) --> \"%1$s\"[%2$d - 1 .. %2$d - 1 + 3] --> \"%3$s\"", s, n, s[n - 1 .. n - 1 + 3]); // XXX TODO utf-8
writefln("RIGHT$(\"%1$s\", %2$d) --> \"%1$s\"[\"%1$s\".length - %2$d .. \"%2s\".length] --> \"%3$s\"", s, n, s[s.length - n .. s.length]); // XXX TODO utf-8
writefln("LEN(\"%1$s\") --> \"%1$s\".length --> %2$d", s, s.length);
writefln("VAL(\"%1$s\") --> to!(float)(\"%1$s\") --> %2$f", s, to!(float)(s)); // XXX TODO catch error
writefln("STR$(%1$d) --> to!(string)(%1$d) --> \"%2$s\"", n, to!(string)(n));
writefln("SPC(%1$d) --> repeat(' ', %1$d) --> \"%2$s\"", n, repeat(' ', n));
writefln("SPC(%1$d) --> replicate(\" \", %1$d) --> \"%2$s\"", n, replicate(" ", n));
}
In Go
/*
Strings
Original version in BASIC:
Example included in Vintage BASIC 1.0.3.
http://www.vintage-basic.net
This version in Go:
Copyright (c) 2024, Marcos Cruz (programandala.net)
SPDX-License-Identifier: Fair
Written on 2024-12-29/30.
Last modified: 20250105T1151+0100.
*/
package main
import "fmt"
import "strconv"
import "strings"
func inputString(prompt string) string {
fmt.Print(prompt)
var s = ""
fmt.Scanf("%s", &s)
return s
}
func inputInt(prompt string) int {
var number int64
var err error
for {
number, err = strconv.ParseInt(inputString(prompt), 10, 0)
if err == nil {
break
} else {
fmt.Println("Integer expected.")
}
}
return int(number)
}
func main() {
var s = inputString("Enter a string: ")
var n = inputInt("Enter an integer: ")
fmt.Println()
fmt.Printf("ASC(\"%s\") --> ", s)
fmt.Printf("int([]rune(\"%s\")[0]) --> %v\n", s, int([]rune(s)[0]))
fmt.Printf("CHR$(%v) --> ", n)
fmt.Printf("rune(%v) --> '%v'\n", n, rune(n))
fmt.Printf("LEFT$(\"%s\", %v) --> ", s, n)
//fmt.Printf("\"%s\"[:%v] --> \"%s\"\n", s, n, s[:n]) // byte slices, ASCII only
fmt.Printf("string([]rune(\"%s\")[:%v])) --> \"%s\"\n", s, n, string([]rune(s)[:n]))
fmt.Printf("MID$(\"%s\", %v) --> ", s, n)
// XXX FIXME When n is greater than string length, the result is not that of the BASIC original:
// fmt.Printf("\"%s\"[%v-1:] --> \"%s\"\n", s, n, s[n-1:]) // byte slices, ASCII only
fmt.Printf("string([]rune(\"%s\")[%v-1:])) --> \"%s\"\n", s, n, string([]rune(s)[n-1:]))
fmt.Printf("MID$(\"%s\", %v, 3) --> ", s, n)
// fmt.Printf("\"%s\"[%v-1:%v-1+3] --> \"%s\"\n", s, n, n, s[n-1:n-1+3]) // byte slices, ASCII only
fmt.Printf("string([]rune(\"%s\")[%v-1:%v-1+3])) --> \"%s\"\n", s, n, n, string([]rune(s)[n-1:n-1+3]))
fmt.Printf("RIGHT$(\"%s\", %v) --> ", s, n)
// fmt.Printf("\"%s\"[len(\"%s\")-%v:] --> \"%s\"\n", s, s, n, s[len(s)-n:]) // byte slices, ASCII only
fmt.Printf("string([]rune(\"%s\")[len([]rune(\"%s\"))-%v:])) --> \"%s\"\n", s, s, n, string([]rune(s)[len([]rune(s))-n:]))
fmt.Printf("LEN(\"%s\") --> ", s)
//fmt.Printf("len(\"%s\") --> %v\n", s, len(s)) // byte slices, ASCII only
fmt.Printf("len([]rune(\"%s\")) --> %v\n", s, len([]rune(s))) // byte slices, ASCII only
fmt.Printf("VAL(\"%s\") --> ", s)
var val, _ = strconv.ParseInt(s, 10, 0)
fmt.Printf("var val, err = strconv.ParseInt(\"%s\", 10, 0) /* result in `val`, error in `err` */ --> %v\n", s, val)
fmt.Printf("STR$(%v) --> ", n)
fmt.Printf("fmt.Sprint(%v) --> \"%s\"\n", n, fmt.Sprint(n))
fmt.Printf("SPC(%v) --> ", n)
fmt.Printf("strings.Repeat(\" \", %v) --> \"%s\"\n", n, strings.Repeat(" ", n))
}
In Hare
// Strings
//
// Original version in BASIC:
// Example included in Vintage BASIC 1.0.3.
// http://www.vintage-basic.net
//
// This version in Hare:
// Copyright (c) 2025, Marcos Cruz (programandala.net)
// SPDX-License-Identifier: Fair
//
// Written in 2025-02-14/15.
//
// Last modified: 20260213T1645+0100.
// Modules {{{1
// =============================================================================
use bufio;
use fmt;
use os;
use strconv;
use strings;
// User input {{{1
// =============================================================================
fn print_prompt(prompt: str) void = {
fmt::print(prompt)!;
bufio::flush(os::stdout)!;
};
fn accept_string(prompt: str = "") str = {
print_prompt(prompt);
const buffer = match (bufio::read_line(os::stdin)!) {
case let buffer: []u8 =>
yield buffer;
case =>
return "";
};
defer free(buffer);
return strings::dup(strings::fromutf8(buffer)!)!;
};
fn accept_integer() (int | ...strconv::error) = {
const s = accept_string();
defer free(s);
return strconv::stoi(s);
};
fn prompted_integer(prompt: str) (int | ...strconv::error) = {
fmt::print(prompt)!;
bufio::flush(os::stdout)!;
return accept_integer();
};
fn prompted_valid_integer(prompt: str, error: str = "Integer expected.") int = {
let result: int = 0;
for (true) {
match (prompted_integer(prompt)) {
case let i: int =>
result = i;
break;
case =>
fmt::println(error)!;
};
};
return result;
};
// Main {{{1
// =============================================================================
fn repeat(s: str, n: int) str = {
let result = "";
for (let i: int = 0; i < n; i += 1) {
result = strings::concat(result, s)!;
};
return result;
};
export fn main() void = {
let s = accept_string("Enter a string: ");
defer free(s);
let n = prompted_valid_integer("Enter an integer: ");
fmt::println()!;
fmt::printf("ASC(\"{}\") --> ", s)!;
fmt::printf("strings::toutf8(\"{}\"[0]): int --> ", s)!;
fmt::printfln("{}", strings::toutf8(s)[0]: int)!;
fmt::printf("CHR$({}) --> ", n)!;
fmt::printfln("{}: rune --> '{}'", n, n: rune)!;
// XXX FIXME When `n` is greater than the string length, the behaviour
// is different from the original `LEFT$`, `MID$` and `RIGHT$`.
fmt::printf("LEFT$(\"{}\", {}) --> ", s, n)!;
fmt::printf("strings::sub(\"{}\", 0, {}: size) --> ", s, n)!;
fmt::printfln("\"{}\"", strings::sub(s, 0, n: size))!;
fmt::printf("MID$(\"{}\", {}) --> ", s, n)!;
fmt::printf("strings::sub(\"{0}\", ({1} - 1): size, len(\"{0}\")) --> ", s, n)!;
fmt::printfln("\"{}\"", strings::sub(s, (n - 1): size, len(s)))!;
fmt::printf("MID$(\"{}\", {}, 3) --> ", s, n)!;
fmt::printf("strings::sub(\"{0}\", ({1} - 1): size, ({1} - 1 + 3): size) --> ", s, n)!;
fmt::printfln("\"{}\"", strings::sub(s, (n - 1): size, (n - 1 + 3): size))!;
fmt::printf("RIGHT$(\"{}\", {}) --> ", s, n)!;
fmt::printf("strings::sub(\"{0}\", len(\"{0}\") - {1}: size, len(\"{0}\")) --> ", s, n)!;
fmt::printfln("\"{}\"", strings::sub(s, len(s) - n: size, len(s)))!;
fmt::printf("LEN(\"{}\") --> ", s)!;
fmt::printfln("len(\"{}\") --> {}", s, len(s))!;
fmt::printf("VAL(\"{}\") --> ", s)!;
fmt::printf("match (strconv::stof64(\"{}\")) {{ case let i: int => yield i; case => yield 0; }}", s)!;
fmt::printfln(" --> {}",
match (strconv::stof64(s)) {
case let i: f64 =>
yield i;
case =>
yield 0;
}
)!;
fmt::printf("STR$({}) --> ", n)!;
fmt::printfln("fmt::asprint({}) --> \"{}\"", n, fmt::asprint(n)!)!;
fmt::printf("SPC({}) --> ", n)!;
fmt::printfln("repeat(\" \", {}) --> \"{}\"", n, repeat(" ", n))!;
fmt::printf("NB: `repeat` is an ad hoc function.")!;
};
In Janet
# Strings
# Original version in BASIC:
# Example included in Vintage BASIC 1.0.3.
# http://www.vintage-basic.net
# This version in Janet:
# Copyright (c) 2025, Marcos Cruz (programandala.net)
# SPDX-License-Identifier: Fair
#
# Written on 2025-12-24.
#
# Last modified 20251225T1946+0100.
(defn accept-string [prompt-text]
(prin prompt-text)
(string/trim (getline)))
(defn accept-integer [prompt-text-text]
(def input (accept-string prompt-text-text))
(def number (scan-number input))
(if number
(math/trunc number)
(do
(print "Number expected.")
(accept-integer prompt-text-text))))
(defn main [& args]
(def s (accept-string "Enter a string: "))
(def n (accept-integer "Enter a number: "))
(print
(string/format
"ASC(\"%s\") --> (get (string/bytes \"%s\") 0) --> %d"
s s (get (string/bytes s) 0)))
(print
(string/format
"CHR$(%d) --> (string/from-bytes %d) --> \"%s\""
n n (string/from-bytes n)))
(print
(string/format
"LEFT$(\"%s\", %d) --> (string/slice \"%s\" 0 (min %d (length \"%s\"))) --> \"%s\""
s n s n s (string/slice s 0 (min n (length s)))))
(print
(string/format
"MID$(\"%s\", %d) --> (string/slice \"%s\" (min (- %d 1) (length \"%s\"))) --> \"%s\""
s n s n s (string/slice s (min (- n 1) (length s)))))
(print
(string/format
"MID$(\"%s\", %d, 3) --> (string/slice \"%s\" (min (- %d 1) (length \"%s\")) (min (+ (- %d 1 ) 3) (length \"%s\"))) --> \"%s\""
s n s n s n s (string/slice s (min (- n 1) (length s)) (min (+ (- n 1) 3) (length s)))))
(print
(string/format
"RIGHT$(\"%s\", %d) --> (string/slice \"%s\" (max (- (+ 1 (length \"%s\"))) (- (+ 1 %d)))) --> \"%s\""
s n s s n (string/slice s (max (- (+ 1 (length s))) (- (+ 1 n))))))
(print
(string/format
"LEN(\"%s\") --> (length \"%s\") --> %d"
s s (length s)))
(print
(string/format
"VAL(\"%s\") --> (or (scan-number \"%s\") 0) --> %d"
s s (or (scan-number s) 0)))
(print
(string/format
"STR$(%d) --> (string %d) --> \"%s\""
n n (string n)))
(print
(string/format
"SPC(%d) --> (string/repeat \" \" %d) --> \"%s\""
n n (string/repeat " " n))))
In Julia
# Strings
# Original version in BASIC:
# Example included in Vintage BASIC 1.0.3.
# http://www.vintage-basic.net
# This version in Julia:
# Copyright (c) 2023, Marcos Cruz (programandala.net)
# SPDX-License-Identifier: Fair
# Written in 2023-07, 2023-09.
# Last modified: 20240704T1050+0200.
using Unicode
print("Enter a string: ")
s = readline()
n = 0
while true
print("Enter a whole number: ")
f = tryparse(Float64, readline())
if f != nothing
global n = convert(Int64, floor(f))
if n == f
break
end
end
println("Not a valid whole number.")
end
print("ASC(\"$s\") --> ")
print("convert(Int, convert(Char, \"$s\"[1])) --> ")
println(convert(Int, s[1]))
print("CHR\$($n) --> ")
print("convert(Char, $n) --> ")
println("'", convert(Char, n), "'")
print("LEFT\$(\"$s\", $n) --> ")
print("graphemes(\"$s\", 1 : min($n, length(\"$s\"))) --> ")
println("\"", graphemes(s, 1 : min(n, length(s))), "\"")
print("MID\$(\"$s\", $n) --> ")
print("graphemes(\"$s\", $n : length(\"$s\") --> ")
println("\"", graphemes(s, n : length(s)), "\"")
print("MID\$(\"$s\", $n, 3) --> ")
print("graphemes(\"$s\", $n : min($n + 3 - 1, length(\"$s\")) --> ")
println("\"", graphemes(s, n : min(n + 3 - 1, length(s))), "\"")
print("RIGHT\$(\"$s\", $n) --> ")
print("graphemes(\"$s\", max(length(\"$s\") - $n + 1, 1) : length(\"$s\") --> ")
println("\"", graphemes(s, max(length(s) - n + 1, 1) : length(s)), "\"")
print("LEN(\"$s\") --> ")
print("length(\"$s\") --> ")
println(length(s))
print("VAL(\"$s\") --> ")
print("tryparse(Float64, \"$s\") == nothing ? 0 : parse(Float64, \$$s\$) --> ")
println(tryparse(Float64, s) == nothing ? 0 : parse(Float64, s))
print("STR\$($n) --> ")
print("string($n) --> ")
println("\"", string(n), "\"")
print("SPC($n) --> ")
print("repeat(\" \", $n) --> ")
println("\"", repeat(" ", n), "\"")
In Kotlin
/*
Strings
Original version in BASIC:
Example included in Vintage BASIC 1.0.3.
http://www.vintage-basic.net
This version in Kotlin:
Copyright (c) 2023, Marcos Cruz (programandala.net)
SPDX-License-Identifier: Fair
Written in 2023-09, 2023-10.
Last modified: 20260205T1349+0100.
*/
fun main() {
print("Enter a string: ")
val s = readln()
print("Enter a number: ")
val input = readln()
val n = input.toInt()
print("$s and $n\n")
print("ASC(\"$s\") --> ")
print("\"$s\"[0].code --> ")
println("${s[0].code}")
print("CHR$($n) --> ")
print("$n.toChar() --> ")
println("'${n.toChar()}'")
print("LEFT$(\"$s\", $n) --> ")
print("\"$s\".substring(0, minOf(\"$s\".length $n)) --> ")
println(s.substring(0, minOf(s.length, n)))
print("MID$(\"$s\", $n) --> ")
print("\"$s\".substring(minOf(\"$s\".length, $n - 1)) --> ")
println(s.substring(minOf(s.length, n - 1)))
print("MID$(\"$s\", $n, 3) --> ")
print("\"$s\".substring(minOf(\"$s\".length, $n - 1), minOf(\"$s\".length, $n - 1 + 3)) --> ")
println(s.substring(minOf(s.length, n - 1), minOf(s.length, n - 1 + 3)))
print("RIGHT$(\"$s\", $n) --> ")
print("\"$s\".substring(maxOf(0, \"$s\".length - $n)) --> ")
println(s.substring(maxOf(0, s.length - n)))
print("LEN(\"$s\") --> ")
print("\"$s\".lenght --> ")
println(s.length)
print("VAL(\"$s\") --> ")
print("\"$s\".toFloat() --> ")
println("${try { s.toFloat() } catch(e: Exception){ 0.0 }}")
print("STR$($n) --> ")
print("$n.toString() --> ")
println("\"${n.toString()}\"")
print("SPC($n) --> ")
print("\" \".repeat($n) --> ")
println("\"${" ".repeat(n)}\"")
}
In Nim
#[
Strings
Original version in BASIC:
Example included in Vintage BASIC 1.0.3.
http://www.vintage-basic.net
This version in Nim:
Copyright (c) 2023, 2025, Marcos Cruz (programandala.net)
SPDX-License-Identifier: Fair
Written on 2023-08-27, 2025-01-20.
Last modified: 20250405T0304+0200.
]#
import std/strutils
write(stdout, "Enter a string: ")
let s = readLine(stdin)
var n: int
while true:
try:
write(stdout, "Enter a number: ")
n = parseInt(readLine(stdin))
break
except ValueError:
writeLine(stdout, "Integer expected.")
echo ""
echo "ASC(\"", s, "\") --> int(char(", s, "[0])) --> ", int(char(s[0]))
echo "CHR$(", n, ") --> char(", n, ") --> '", char(n), "'"
echo "LEFT$(\"", s, "\", ", n, ") --> \"", s, "\"[0 ..< ", n, "] --> ", s[0 ..< n]
echo "MID$(\"", s, "\", ", n, ") --> \"", s, "\"[", n, "-1 .. ^1] --> ", s[n-1 .. ^1]
echo "MID$(\"", s, "\", ", n, ", 3) --> \"", s, "\"[", n, "-1 ..< ", n, "+3-1] --> ", s[n-1 ..< n+3-1]
echo "RIGHT$(\"", s, "\", ", n, ") --> \"", s, "\"[^", n, " .. ^1] --> ", s[^n .. ^1]
echo "LEN(\"", s, "\") --> \"", s, "\".len --> ",s.len
echo "VAL(\"", s, "\") --> (try: parseInt(\"", s, "\") except: 0) --> ", (try: parseInt(s) except: 0)
echo "STR$(", n, ") --> $", n, " --> \"", $n, "\""
echo "SPC(", n, ") --> strutils.repeat(' ', ", n, ") --> \"", strutils.repeat(' ',n), "\""
In Odin
/*
Strings
Original version in BASIC:
Example included in Vintage BASIC 1.0.3.
http://www.vintage-basic.net
This version in Odin:
Copyright (c) 2023, 2025, Marcos Cruz (programandala.net)
SPDX-License-Identifier: Fair
Written in 2023-04, 2023-09, 2023-12, 2025-04.
Last modified: 20250424T1230+0200.
*/
package vintage_basic_strings
import "../lib/anodino/src/read"
import "core:fmt"
import "core:strconv"
import "core:strings"
import "core:unicode/utf8"
get_string :: proc(prompt : string) -> string {
fmt.print(prompt)
return read.a_string() or_else ""
}
get_number :: proc(prompt : string) -> (number : int) {
ok := false
for ; !ok; number, ok = strconv.parse_int(get_string(prompt)) {}
return
}
main :: proc() {
s := get_string("Enter a string: ")
n := get_number("Enter an integer: ")
fmt.println()
fmt.printf("ASC(\"%s\") --> ", s)
fmt.printfln("int(utf8.string_to_runes(\"%s\")[0]) --> %v", s, int(utf8.string_to_runes(s)[0]))
fmt.printf("CHR$(%v) --> ", n)
fmt.printfln("rune(%v) --> '%v'", n, rune(n))
fmt.printf("LEFT$(\"%s\", %v) --> ", s, n)
fmt.printfln("strings.cut(\"%s\", %v, %v) --> \"%s\"", s, 0, n, strings.cut(s, 0, n))
fmt.printf("MID$(\"%s\", %v) --> ", s, n)
// XXX FIXME When n is greater than string length, the result is not that of the BASIC original:
fmt.printfln("strings.cut(\"%[0]s\", %[1]v - 1, len(\"%[0]s\") - %[1]v - 1) --> \"%[2]s\"", s, n, strings.cut(s, n - 1, len(s) - 1))
fmt.printf("MID$(\"%s\", %v, 3) --> ", s, n)
fmt.printfln("strings.cut(\"%s\", %v - 1, 3) --> \"%s\"", s, n, strings.cut(s, n - 1, 3))
fmt.printf("RIGHT$(\"%s\", %v) --> ", s, n)
fmt.printfln("strings.cut(\"%[0]s\", len(\"%[0]s\")-%[1]v, %[1]v) --> \"%[2]s\"", s, n, strings.cut(s, len(s) - n, n))
fmt.printf("LEN(\"%s\") --> ", s)
fmt.printfln("len(\"%s\") --> %v", s, len(s))
fmt.printf("VAL(\"%s\") --> ", s)
fmt.printfln("strconv.parse_int(\"%s\") or_else 0 --> %v", s, strconv.parse_int(s) or_else 0)
fmt.printf("STR$(%v) --> ", n)
fmt.printfln("fmt.tprint(%v) --> \"%s\"", n, fmt.tprint(n))
fmt.printf("SPC(%v) --> ", n)
fmt.printfln("strings.repeat(\" \", %v) --> \"%s\"", n, strings.repeat(" ", n))
}
In Pike
#! /usr/bin/env pike
// Strings
// Original version in BASIC:
// Example included in Vintage BASIC 1.0.3.
// http://www.vintage-basic.net
// This version in Pike:
// Copyright (c) 2025, Marcos Cruz (programandala.net)
// SPDX-License-Identifier: Fair
//
// Written on 2025-03-10, 2025-03-12.
//
// Last modified: 20250312T1809+0100.
string accept_string(string prompt) {
write(prompt);
return Stdio.stdin->gets();
}
int accept_integer(string prompt) {
// NB The casting accepts any valid integer at the start of the string
// and ignores the rest; if no valid integer is found at the start of
// the string, zero is returned.
return (int) accept_string(prompt);
}
int accept_valid_integer(string prompt) {
int n = 0;
while (n <= 0) {
n = accept_integer(prompt);
if (n <= 0) {
write("Integer greater than zero expected.\n");
}
}
return n;
}
void main() {
string s = accept_string("Enter a string: ");
int n = accept_valid_integer("Enter an integer: ");
write("ASC(\"%[0]s\") --> (int) \"%[0]s\"[0] --> %[1]d\n", s, (int) s[0]);
write("CHR$(%[0]d) --> sprintf(\"%%c\", %[0]d) --> \"%[1]s\"\n", n, sprintf("%c", n));
write("LEFT$(\"%[0]s\", %[1]d) --> \"%[0]s\"[..%[1]d - 1] --> \"%[2]s\"\n", s, n, s[..n - 1]);
write("MID$(\"%[0]s\", %[1]d) --> \"%[0]s\"[%[1]d - 1..] --> \"%[2]s\"\n", s, n, s[n - 1..]);
write("MID$(\"%[0]s\", %[1]d, 3) --> \"%[0]s\"[%[1]d - 1 .. %[1]d - 1 + 3 - 1] --> \"%[2]s\"\n", s, n, s[n - 1 .. n - 1 + 3 - 1]);
write("RIGHT$(\"%[0]s\", %[1]d) --> \"%[0]s\"[sizeof(%[0]s) - %[1]d..] --> \"%[2]s\"\n", s, n, s[sizeof(s) - n..]);
write("LEN(\"%[0]s\") --> sizeof(\"%[0]s\") --> %[1]d\n", s, sizeof(s));
write("VAL(\"%[0]s\") --> (float) \"%[0]s\" --> %[1]f\n", s, (float) s);
write("STR$(%[0]d) --> (string) %[0]d --> \"%[1]s\"\n", n, (string) n);
write("SPC(%[0]d) --> \" \" * %[0]d -> \"%[1]s\"\n", n, " " * n);
}
In Python
# Strings
# Original version in BASIC:
# Example included in Vintage BASIC 1.0.3.
# http://www.vintage-basic.net
# This version in Python:
# Copyright (c) 2024, Marcos Cruz (programandala.net)
# SPDX-License-Identifier: Fair
#
# Written on 2024-10-29.
#
# Last modified: 20241203T2231+0100.
import ast
s = input("Enter a string: ")
while True:
try:
n = int(ast.literal_eval(input("Enter a number: ")))
break
except:
print("Not a valid number.")
print(f"ASC(\"{s}\"[0]) --> ", end = "")
print(f"ord(\"{s}\"[0])) --> ", end = "")
print(ord(s[0]))
print(f"CHR$({n}) --> ", end = "")
print(f"chr({n}) --> ", end = "")
print('"', chr(n), '"', sep = "")
print(f"LEFT$(\"{s}\", {n}) --> ", end = "")
print(f"\"{s}\"[:{n}] --> ", end = "")
print("\"", s[:n], "\"", sep = "")
print(f"MID$(\"{s}\", {n}) --> ", end = "")
print(f"\"{s}\"[{n} : len(\"{s}\")] --> ", end = "")
print("\"", s[n : len(s)], "\"", sep = "")
print(f"MID$(\"{s}\", {n}, 3) --> ", end = "")
print(f"\"{s}\"[{n} : min({n} + 3, len(\"{s}\"))] --> ", end = "")
print("\"", s[n : min(n + 3, len(s))], "\"", sep = "")
print(f"RIGHT$(\"{s}\", {n}) --> ", end = "")
print(f"(\"{s}\", max(len(\"{s}\") - {n}, 1) : length(\"{s}\") --> ", end = "")
print("\"", s[max(len(s) - n, 0) : len(s)], "\"", sep = "")
print(f"LEN(\"{s}\") --> ", end = "")
print(f"len(\"{s}\") --> ", end = "")
print(len(s))
# XXX TODO return 0 is the string is not a valid number
print(f"VAL(\"{s}\") --> ", end = "")
print(f"int(\"{s}\") --> ", end = "")
print(int(s))
print(f"STR$({n}) --> ", end = "")
print(f"str({n}) --> ", end = "")
print("\"", str(n), "\"", sep = "")
print(f"SPC({n}) --> ", end = "")
print(f"\" \" * {n} --> ", end = "")
print("\"", " " * n, "\"", sep = "")
In Raku
# Strings
#
# Original version in BASIC:
# Example included in Vintage BASIC 1.0.3.
# http://www.vintage-basic.net
#
# This version in Raku:
# Copyright (c) 2024, 2025, Marcos Cruz (programandala.net)
# SPDX-License-Identifier: Fair
#
# Written in 2024-12.
#
# Last modified: 20250731T1726+0200.
sub prompt_number(Str $prompt --> Int) {
my Int $n;
loop {
try {
$n = +prompt $prompt;
CATCH {
default {
put 'Integer expected.';
next;
}
}
}
last;
}
return floor $n;
}
my $s = prompt 'Enter a string: ';
my $n = prompt_number 'Enter an integer: ';
put "";
put "ASC(\"$s\") --> ord(\"$s\") --> $(ord($s))";
put "CHR\$($n) --> $n.chr --> \"", $n.chr, '"';
put "LEFT\$(\"$s\", $n) --> \"$s\".comb.head($n).join --> '", $s.comb.head($n).join, "'";
put "MID\$(\"$s\", $n) --> \"$s\".comb[$n - 1 .. *].join --> '", $s.comb[$n - 1 .. *].join, "'";
put "MID\$(\"$s\", $n, 3) --> \"$s\".comb[$n - 1 .. $n -1 + 3 - 1].join --> '", $s.comb[$n - 1 .. $n - 1 + 3 - 1].join, "'";
put "RIGHT\$(\"$s\", $n) --> \"$s\".comb.tail($n).join --> '", $s.comb.tail($n).join, "'";
put "LEN(\"$s\") --> \"$s\".chars --> ", $s.chars;
put "VAL(\"$s\") --> val(\"$s\") --> ", val($s);
sub val_or_0(Str $s) {
my Any $n;
try { $n = +$s; CATCH { default { $n = 0 } } }
return $n
}
put "VAL(\"$s\") --> val_or_0(\"$s\") --> ", val_or_0($s), " # custom subroutine with `try`";
put "STR$($n) --> $n.Str --> \"", $n.Str, '"';
put "SPC($n) --> ' ' x $n --> '", ' ' x $n, "'";
In Ring
/*
Strings
Original version in BASIC:
Example included in Vintage BASIC 1.0.3.
http://www.vintage-basic.net
This version in Ring:
Copyright (c) 2024, Marcos Cruz (programandala.net)
SPDX-License-Identifier: Fair
Written in 2024-03, 2024-04.
Last modified: 20240411T0954+0200.
*/
// Print the given prompt, get an integer from the user, check it and return it.
func validInteger(prompt)
while true
put prompt
get n
if isDigit(n)
break
else
put "Integer number expected. Retry." + nl
end
end
return 0 + n
end
func main() {
print("Enter a string: ")
s = getString()
n = validInteger("Enter a number: ")
print(`ASC("#{s}") --> `)
print(`ascii(left("#{s}", 1)) --> `)
? ascii(left(s, 1))
print(`CHR$(#{n}) --> `)
print(`char(#{n}) --> `)
? char(n)
print(`LEFT$("#{s}", #{n}) --> `)
print(`left("#{s}", n) --> `)
? left(s,n)
print(`MID$("#{s}", #{n}) --> `)
print(`substr("#{s}", #{n}) --> `)
? substr(s, n)
print(`MID$("#{s}", #{n}, 3) --> `)
print(`substr("#{s}", #{n}, 3) --> `)
? substr(s, n, 3)
print(`RIGHT$("#{s}", #{n}) --> `)
print(`right("#{s}", n) --> `)
? right(s,n)
print(`LEN("#{s}") --> `)
print(`len("#{s}") --> `)
? len(s)
print(`VAL("#{s}") --> `)
print(`number("#{s}") --> `)
? number(s)
print(`VAL("#{s}") --> `)
print(`0 + "#{s}" --> `)
? 0 + s
print(`STR$(#{n}) --> `)
print(`string(#{n}) --> `)
? string(n)
print(`SPC(#{n}) --> `)
print(`copy(" ", #{n}) --> `)
? `"` + copy(" ", n) + `"`
}
In Scala
// Strings
//
// Original version in BASIC:
// Example included in Vintage BASIC 1.0.3.
// http://www.vintage-basic.net
//
// This version in Scala:
// Copyright (c) 2023, Marcos Cruz (programandala.net)
// SPDX-License-Identifier: Fair
//
// Written in 2023-09-28/29.
//
// Last modified: 20231209T2008+0100.
// Prompts the user to enter a command and returns it trimmed.
def readString(prompt : String = "") : String =
scala.io.StdIn.readLine(prompt).trim
// Prompts the user to enter an integer and returns it.
def readInteger(prompt : String = "") : Int =
var integer = 0
var ok = false
while !ok do
try
integer = readString(prompt).toInt
ok = true
catch
case _ => println("That wasn't a valid integer.")
integer
@main def main() =
val s = readString("Enter a string: ")
val n = readInteger("Enter an integer: ")
print(s"ASC(\"$s\") --> ")
print(s"\"$s\"(0).toChar.toInt --> ")
println(s"${s(0).toChar.toInt}")
print(s"CHR$$($n) --> ")
print(s"$n.toChar --> ")
println(s"'${n.toChar}'")
print(s"LEFT$$(\"$s\", $n) --> ")
print(s"\"$s\".substring(0, $n.min(\"$s\".size)) --> ")
println(s"\"${s.substring(0, n.min(s.size))}\"")
print(s"MID$$(\"$s\", $n) --> ")
print(s"\"$s\".substring(($n - 1).min(\"$s\".size)) --> ")
println(s"\"${s.substring((n - 1).min(s.size))}\"")
print(s"MID$$(\"$s\", $n, 3) --> ")
print(s"\"$s\".substring(($n - 1).min(\"$s\".size), ($n - 1 + 3).min(\"$s\".size)) --> ")
println(s"\"${s.substring((n - 1).min(s.size), (n - 1 + 3).min(s.size))}\"")
print(s"RIGHT$$(\"$s\", $n) --> ")
print(s"\"$s\".substring((\"$s\".size - $n).max(0)) --> ")
println(s"\"${s.substring((s.size - n).max(0))}\"")
print(s"LEN(\"$s\") --> ")
print(s"\"$s\".size --> ")
println(s.size)
print(s"VAL(\"$s\") --> ")
print(s"try \"$s\".trim.toFloat catch case _ => (0.0) --> ")
println(try s.trim.toFloat catch case _ => (0.0))
print(s"STR$$($n) --> ")
print(s"$n.toString --> ")
println(s"\"${n.toString}\"")
print(s"SPC($n) --> ")
print(s"\" \".repeat($n) --> ")
println(s"\"${" ".repeat(n)}\"")
In Scheme
; Strings
; Original version in BASIC:
; Example included in Vintage BASIC 1.0.3.
; http://www.vintage-basic.net
; This version in Scheme (Bigloo):
; Copyright (c) 2025, Marcos Cruz (programandala.net)
; SPDX-License-Identifier: Fair
;
; Written on 2025-12-05.
;
; Last modified 20251224T1216+0100.
(module strings)
(define (accept-string prompt)
(display prompt)
(read-line))
(define (accept-integer prompt)
(let ((input (accept-string prompt)))
(let ((number (string->number input)))
(if number
(truncate number)
(begin
(display "Number expected.")
(newline)
(accept-integer prompt))))))
(define s (accept-string "Enter a string: "))
(define n (accept-integer "Enter a number: "))
(display
(format
"ASC(\"~s\") --> (char->integer (car (string->list \"~s\"))) --> ~d\n"
s s (char->integer (car (string->list s)))))
(display
(format
"CHR$(~d) --> (integer->char ~d) --> \"~s\"\n"
n n (integer->char n)))
(display
(format
"LEFT$(\"~s\", ~d) --> (substring \"~s\" 0 ~d) --> \"~s\"\n"
s n s n (substring s 0 n)))
(display
(format
"MID$(\"~s\", ~d) --> (substring \"~s\" (- ~d 1)) --> \"~s\"\n"
s n s n (substring s (- n 1))))
(display
(format
"MID$(\"~s\", ~d, 3) --> (substring \"~s\" (- ~d 1) (+ (- ~d 1 ) 3)) --> \"~s\"\n"
s n s n n (substring s (- n 1) (+ (- n 1) 3))))
(display
(format
"RIGHT$(\"~s\", ~d) --> (substring \"~s\" (- (string-length \"~s\") ~d)) --> \"~s\"\n"
s n s s n (substring s (- (string-length s) n))))
(display
(format
"LEN(\"~s\") --> (string-length \"~s\") --> ~d\n"
s s (string-length s)))
(display
(format
"VAL(\"~s\") --> (or (string->number \"~s\") 0) --> ~d\n"
s s (or (string->number s) 0)))
(display
(format
"STR$(~d) --> (number->string ~d) --> \"~s\"\n"
n n (number->string n)))
(display
(format
"SPC(~d) --> (make-string ~d #\\space) --> \"~s\"\n"
n n (make-string n #\space)))
In Swift
/*
Strings
Original version in BASIC:
Example included in Vintage BASIC 1.0.3.
http://www.vintage-basic.net
This version in Swift:
Copyright (c) 2025, Marcos Cruz (programandala.net)
SPDX-License-Identifier: Fair
Written on 2025-04-24.
Last modified: 20250424T1551+0200.
*/
func promptedString(with prompt: String) -> String {
while true {
print(prompt, terminator: "")
if let input = readLine() {
return input
}
}
}
func promptedInteger(with prompt: String) -> Int {
while true {
print(prompt, terminator: "")
if let input = readLine(), let number = Int(input) {
return number
} else {
print("Integer expected.")
}
}
}
var s = promptedString(with: "Enter a string: ")
var n = promptedInteger(with: "Enter an integer: ")
var start: String.Index
var end: String.Index
var result: String.SubSequence
print()
print("ASC(\"\(s)\") --> ", terminator: "")
print("\"s\".unicodeScalars.map { $0.value } [0] --> \(s.unicodeScalars.map { $0.value } [0])")
print("CHR$(\(n)) --> ", terminator: "")
print("Character(UnicodeScalar(\(n))!) --> \"\(Character(UnicodeScalar(n)!))\"")
// XXX TODO check limits of substrings in order to mimic the behaviour of the
// original BASIC functions
print("LEFT$(\"\(s)\", \(n)) -->")
print("""
let s: \"\(s)\"
let n: \(n)
let end: String.Index = s.index(s.startIndex, offsetBy: n)
let result: StringSubSequence = s[..<end]
""")
end = s.index(s.startIndex, offsetBy: n)
result = s[..<end]
print("--> \"\(result)\"")
print("MID$(\"\(s)\", \(n)) -->")
print("""
let s: \"\(s)\"
let n: \(n)
let start: String.Index = s.index(s.startIndex, offsetBy: n - 1)
let result: String.SubSequence = s[start...]
""")
start = s.index(s.startIndex, offsetBy: n - 1)
result = s[start...]
print("--> \"\(result)\"")
print("MID$(\"\(s)\", \(n), 3) -->")
print("""
let s: \"\(s)\"
let n: \(n)
let start: String.Index = s.index(s.startIndex, offsetBy: n - 1)
let end: String.Index = s.index(start, offsetBy: 3)
let result String.SubSequence = s[start..<end]
""")
start = s.index(s.startIndex, offsetBy: n - 1)
end = s.index(start, offsetBy: 3)
result = s[start..<end]
print("--> \"\(result)\"")
print("RIGHT$(\"\(s)\", \(n)) --> ")
print("""
let s: \"\(s)\"
let n: \(n)
let start: String.Index = s.index(s.endIndex, offsetBy: -n)
let result: String.SubSequence = s[start...]
""")
start = s.index(s.endIndex, offsetBy: -n)
result = s[start...]
print("--> \"\(result)\"")
print("LEN(\"\(s)\") --> ", terminator: "")
print("\"\(s)\".count --> \(s.count)")
print("VAL(\"\(s)\") --> ", terminator: "")
print("Double(\"\(s)\") ?? 0 --> \(Double(s) ?? 0)")
print("STR$(\(n)) --> ", terminator: "")
print("String(\(n)) --> \"\(String(n))\"")
print("SPC(\(n)) --> ", terminator: "")
print("String(repeating: \" \", count: \(n)) --> \"\(String(repeating: " ", count: n))\"")
In V
/*
Strings
Original version in BASIC:
Example included in Vintage BASIC 1.0.3.
http://www.vintage-basic.net
This version in V:
Copyright (c) 2025, Marcos Cruz (programandala.net)
SPDX-License-Identifier: Fair
Written on 2025-01-03/04.
Last modified: 20250714T1332+0200.
*/
import encoding.utf8
import math
import os
import strconv
import strings
fn input_int(prompt string) int {
mut n := 0
for {
n = strconv.atoi(os.input(prompt)) or { continue }
break
}
return n
}
fn main() {
s := os.input('Enter a string: ')
n := input_int('Enter an integer: ')
println('')
print("ASC('${s}') --> ")
println("int(utf8.get_rune('${s}', 0))) --> ${int(utf8.get_rune(s, 0))}")
print('CHR$(${n}) --> ')
println("rune(${n}) --> '${rune(n)}'")
print("LEFT$('${s}', ${n}) --> ")
println("'${s}'.runes()[0..math.min(${n}, '${s}'.len)].string() --> '${s.runes()[0..math.min(n,
s.len)].string()}'")
// XXX FIXME the program fails when n is out of bounds; BASIC returns an empty string instead
print("MID$('${s}', ${n}) --> ")
println("'${s}'.runes()[${n}-1..].string() --> '${s.runes()[n - 1..].string()}'")
// XXX FIXME the program fails when n is out of bounds; BASIC returns an empty string instead
print("MID$('${s}', ${n}, 3) --> ")
println("'${s}'.runes()[${n}-1..${n}-1+3].string() --> '${s.runes()[n - 1..n - 1 + 3].string()}'")
print("RIGHT$('${s}', ${n}) --> ")
println("'${s}'.runes()#[-${n}..].string() --> '${s.runes()#[-n..].string()}'")
print("LEN('${s}') --> ")
println("'${s}'.len --> ${s.len}")
print("VAL('${s}') --> ")
println("strconv.atoi('${s}') or { 0 } --> ${strconv.atoi(s) or { 0 }}")
print('STR$(${n}) --> ')
println("${n}.str() --> '${n.str()}'")
print('SPC(${n}) --> ')
println("strings.repeat(` `, ${n}) --> '${strings.repeat(` `, n)}'")
}