Programming Fundamentals/Arrays/Lua
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arrays.lua
[edit | edit source]-- This program uses arrays to display temperature conversion tables
-- and temperature as an array subscript to find a given conversion.
--
-- References:
-- https://www.mathsisfun.com/temperature-conversion.html
-- https://www.lua.org/manual/5.1/manual.html
function build_c(size)
local c = {}
local index
local value
for index = 1, size do
value = index * 9 / 5 + 32
c[index] = value
end
return c
end
function build_f(size)
local f = {}
local index
local value
for index = 1, size do
value = (index - 32) * 5 / 9
f[index] = value
end
return f
end
function display_array(name, array)
local index
for index = 1, #array do
io.write(name, "[", index, "] = ", array[index], "\n")
end
end
function find_temperature(c, f)
local temp
local size
size = minimum(#c, #f)
repeat
io.write("Enter a temperature between 1 and ", size, "\n")
temp = tonumber(io.read())
until not (temp < 1 or temp > size)
io.write(temp, "° Celsius is ", c[temp], "° Fahrenheit", "\n")
io.write(temp, "° Fahrenheit is ", f[temp], "° Celsius", "\n")
end
function minimum(value1, value2)
local result
if value1 < value2 then
result = value1
else
result = value2
end
return result
end
function main()
local c
local f
c = build_c(100)
f = build_f(212)
display_array("C", c)
display_array("F", f)
find_temperature(c, f)
end
main()
Try It
[edit | edit source]Copy and paste the code above into one of the following free online development environments or use your own Lua compiler / interpreter / IDE.