Basics of Lua

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

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Sine Wave

--[[
Sine Wave

Original version in BASIC:
    Creative Computing (Morristown, New Jersey, USA), ca. 1980.

This version in Lua:
    Copyright (c) 2023, Marcos Cruz (programandala.net)
    SPDX-License-Identifier: Fair

Last modified 20231103T2310+0100.
]]

function tab(spaces)
    for i = 1, spaces do
        io.write(" ")
    end
end

os.execute("clear")
print("Sine Wave\n")
print("Original version in BASIC:")
print("    Creative computing (Morristown, New Jersey, USA), ca. 1980.\n")
print("This version in Lua:")
print("    Copyright (c) 2023, Marcos Cruz (programandala.net)")
print("    SPDX-License-Identifier: Fair\n")
print("Press Enter to start the program.")
io.read()
os.execute("clear")

word = { "", "" }
io.write("Enter the first word:  ")
word[0] = io.read()
io.write("Enter the second word: ")
word[1] = io.read()
os.execute("clear")

step = 0
for t = 0, 40 , .25 do
    tab(26 + 25 * math.sin(t))
    print(word[step])
    step = (step == 1) and 0 or 1
end

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Basics of Lua

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Sine Wave

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