Basics of F#

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

Tags:

3D Plot

// 3D Plot

// Original version in BASIC, "3D Plot":
//   Creative Computing (Morristown, New Jersey, USA), ca. 1980.

// This version in F# 5.0:
//   Copyright (c) 2024, Marcos Cruz (programandala.net)
//   SPDX-License-Identifier: Fair
//
// Written on 2024-12-20.
//
// Last modified: 20241231T1245+0100.

open System

let PrintCredits() =
  printfn "3D Plot\n"
  printfn "Original version in BASIC:"
  printfn "    Creative computing (Morristown, New Jersey, USA), ca. 1980.\n"
  printfn "This version in F# 5.0:"
  printfn "    Copyright (c) 2024, Marcos Cruz (programandala.net)"
  printfn "    SPDX-License-Identifier: Fair\n"
  printf "Press any key to start. "
  Console.ReadKey() |> ignore

let A z =
  30.0 * Math.Exp(-z * z / 100.0)

let Draw() =

  let WIDTH = 56
  let SPACE = ' '
  let DOT = '*'

  let mutable l = 0
  let mutable z = 0
  let mutable y = 0
  let mutable y1 = 0
  let mutable line : char array = Array.zeroCreate WIDTH
  let mutable output = new String(line)

  let mutable x = -30.0

  while x <= 30.0 do

    for i=0 to WIDTH-1 do
      line.[i] <- SPACE

    l <- 0
    y1 <- 5 * int (Math.Sqrt(900.0 - x * x) / 5.0)

    y <- y1

    while y >= -y1 do
      z <- int (25.0 + A(Math.Sqrt(x * x + double (y * y))) - 0.7 * double y)
      if z > l then
        l <- z
        line.[z] <- DOT
      y <- y + -5

    let output = String(line)
    printfn "%s" output

    x <- x + 1.5

[<EntryPoint>]
let main argv =
  Console.Clear()
  PrintCredits()
  Console.Clear()
  Draw()
  0 // integer exit code

// vim: filetype=fsharp

All versions of 3D Plot

Diamond

// Diamond

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

// This version in F#:
//   Copyright (c) 2024, Marcos Cruz (programandala.net)
//   SPDX-License-Identifier: Fair
//
// Written on 2024-12-30.
//
// Last modified 20241230T1639+0100.

[<EntryPoint>]
let main argv =
  let LINES = 17
  let mutable i = 1
  let mutable j = 1
  while i <= LINES / 2 + 1 do
    j <- 1
    while j <= (LINES + 1) / 2 - i + 1 do
      printf " "
      j <- j + 1
    j <- 1
    while j <= i * 2 - 1 do
      printf "*"
      j <- j + 1
    printfn ""
    i <- i + 1
  i <- 1
  while i <= LINES / 2 do
    j <- 1
    while j <= i + 1 do
      printf " "
      j <- j + 1
    j <- 1
    while j <= ((LINES + 1) / 2 - i) * 2 - 1 do
      printf "*"
      j <- j + 1
    printfn ""
    i <- i + 1
  0 // integer exit code

// vim: filetype=fsharp

All versions of Diamond

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Basics of F#

Description of the page content

3D Plot

Diamond

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