Programming Fundamentals/Functions/Lua

functions.lua

-- This program asks the user for a Fahrenheit temperature, 
-- converts the given temperature to Celsius,
-- and displays the results.
--
-- References:
--     https://www.mathsisfun.com/temperature-conversion.html
--     https://www.lua.org/manual/5.1/manual.html

function get_fahrenheit()
    local fahrenheit
    
    print("Enter Fahrenheit temperature:")
    fahrenheit = tonumber(io.read())
        
    return fahrenheit
end

function calculate_celsius(fahrenheit)
    local celsius
    
    celsius = (fahrenheit - 32) * 5 / 9
        
    return celsius
end

function display_result(fahrenheit, celsius)
    print(fahrenheit .. "° Fahrenheit is " .. celsius .. "° Celsius")
end

function main()
    local fahrenheit
    local celsius
    
    fahrenheit = get_fahrenheit()
    celsius = calculate_celsius(fahrenheit)
    display_result(fahrenheit, celsius)
end

main()

Try It

Copy and paste the code above into one of the following free online development environments or use your own Lua compiler / interpreter / IDE.

• CodeChef
• Ideone
• repl.it
• TutorialsPoint

See Also

• Lua.org: Reference Manual

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