Programming Fundamentals/Function Examples JavaScript

Temperature

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

main();

function main() {
var fahrenheit = getFahrenheit();
var celsius = calculateCelsius(fahrenheit);
displayResult(fahrenheit, celsius);
}

function getFahrenheit() {
var fahrenheit = input("Enter Fahrenheit temperature:");
return fahrenheit;
}

function calculateCelsius(fahrenheit) {
var celsius = (fahrenheit - 32) * 5 / 9;
return celsius;
}

function displayResult(fahrenheit, celsius) {
output(fahrenheit + "° Fahrenheit is " +
celsius + "° Celsius");
}

function input(text) {
if (typeof window === 'object') {
return prompt(text)
}
else if (typeof console === 'object') {
const rls = require('readline-sync');
var value = rls.question(text);
return value;
}
else {
output(text);
var isr = new java.io.InputStreamReader(java.lang.System.in);
var br = new java.io.BufferedReader(isr);
var line = br.readLine();
return line.trim();
}
}

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

Output

```Enter Fahrenheit temperature:
100
100° Fahrenheit is 37.7777777777778° Celsius
```