# Programming Fundamentals/Arrays/JavaScript

## arrays.js

```// 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://en.wikibooks.org/wiki/JavaScript

main();

function main()
{
var c;
var f;

c = buildC(100);
f = buildF(212);
displayArray("C", c);
displayArray("F", f);
findTemperature(c, f);
}

function buildC(size)
{
var c = [];
var index;
var value;

for (index = 0 ; index <= size; index += 1)
{
value = index * 9 / 5 + 32;
c.push(value);
}

return c;
}

function buildF(size)
{
var f = [];
var index;
var value;

for (index = 0 ; index <= size; index += 1)
{
value = (index - 32) * 5 / 9;
f.push(value);
}

return f;
}

function displayArray(name, array)
{
var index;

for (index = 0 ; index <= array.length - 1 ; index += 1)
{
output(name + "[" + index + "] = " + array[index]);
}
}

function findTemperature(c, f)
{
var temp;
var size;

size = minimum(c.length, f.length);
do
{
temp = input("Enter a temperature between 0 and " + (size - 1));
} while (temp < 0 || temp > size - 1);
output(temp + "° Celsius is " + c[temp] + "° Fahrenheit");
output(temp + "° Fahrenheit is " + f[temp] + "° Celsius");
}

function minimum(value1, value2)
{
var result;

if (value1 < value2)
{
result = value1;
}
else
{
result = value2;
}

return result;
}

function input(text) {
if (typeof window === 'object') {
return prompt(text)
}
else if (typeof console === 'object') {
var value = rls.question(text);
return value;
}
else {
output(text);
return line.trim();
}
}

function output(text) {
if (typeof document === 'object') {
document.write(text);
}
else if (typeof console === 'object') {
console.log(text);
}
else {
print(text);
}
}
```

## Try It

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