Basics of Io

Description of the page content

Conversion of old BASIC programs to Io in order to learn the basics of this language.

Tags:

Diamond

#!/usr/bin/env io

/*
Diamond

Original version in BASIC:
    Example included in Vintage BASIC 1.0.3.
    http://www.vintage-basic.net

This version in Io:
    Copyright (c) 2024, Marcos Cruz (programandala.net)
    SPDX-License-Identifier: Fair

Written on 2024-12-02.

Last modified: 20241202T0206+0100.
*/

LINES := 17

for(i, 1, LINES / 2 + 1,
    for(j, 1, (LINES + 1) / 2 - i + 1,
        " " print
    )
    for(j, 1, i * 2 - 1,
        "*" print
    )
    "" println
)

for(i, 1, LINES / 2,
    for(j, 1, i + 1,
        " " print
    )
    for(j, 1, ((LINES + 1) / 2 - i) * 2 - 1,
        "*" print
    )
    "" println
)

Name

#!/usr/bin/env io

/*
Name

Original version in BASIC:
    Example included in Vintage BASIC 1.0.3.
    http://www.vintage-basic.net

This version in Io:
    Copyright (c) 2024, Marcos Cruz (programandala.net)
    SPDX-License-Identifier: Fair

Written on 2024-12-03.

Last modified: 20241203T0045+0100.
*/

"What is your name? " print
name := File standardInput readLine

loop(
    "Enter a number: " print
    number := File standardInput readLine asNumber
    // N.B. Invalid inputs cause a `nan` value and don't pass the test.
    if(number > 0, break)
    "Number greater than 0 expected." println
)

number repeat(
    "Hello, " print  name print  "!" println
)

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