# 5.14: JavaScript Examples

## Temperature

// This program displays a temperature conversion table showing Fahrenheit
// temperatures from 0 to 100, in increments of 10, and the corresponding
// Celsius temperatures using While, Do While, and For loops.
//
// References:
//   https://www.mathsisfun.com/temperature-conversion.html
//   https://en.wikibooks.org/wiki/JavaScript

main();

function main() {
whileLoop();
doLoop();
forLoop();
}

function whileLoop() {
var fahrenheit;
var celsius;

fahrenheit = 0;
while (fahrenheit <= 100) {
celsius = calculateCelsius(fahrenheit);
displayResult(fahrenheit, celsius);
fahrenheit += 10;
}
output("");
}

function doLoop() {
var fahrenheit;
var celsius;

fahrenheit = 0;
do {
celsius = calculateCelsius(fahrenheit);
displayResult(fahrenheit, celsius);
fahrenheit += 10;
} while (fahrenheit <= 100);
output("");
}

function forLoop() {
var fahrenheit;
var celsius;

for (fahrenheit = 0 ; fahrenheit <= 100 ; fahrenheit += 10) {
celsius = calculateCelsius(fahrenheit);
displayResult(fahrenheit, celsius);
}
output("");
}

output("F°\tC°");
}

function calculateCelsius(fahrenheit) {
var celsius;

celsius = (fahrenheit - 32) * 5 / 9;

return celsius;
}

function displayResult(fahrenheit, celsius) {
output(fahrenheit.toString() + "\t" + celsius.toString());
}

// Checks the JavaScript environment and writes to the console,
// the current document, or standard output as appropriate.
// Reference: http://progopedia.com/example/hello-world/114/
function output(text) {
if (typeof console === 'object') {
console.log(text);
}
else if (typeof document === 'object') {
document.write(text);
}
else {
print(text);
}
}


### Output

F°	C°
0	-17.77777777777778
10	-12.222222222222221
20	-6.666666666666667
30	-1.1111111111111112
40	4.444444444444445
50	10
60	15.555555555555555
70	21.11111111111111
80	26.666666666666668
90	32.22222222222222
100	37.77777777777778

F°	C°
0	-17.77777777777778
10	-12.222222222222221
20	-6.666666666666667
30	-1.1111111111111112
40	4.444444444444445
50	10
60	15.555555555555555
70	21.11111111111111
80	26.666666666666668
90	32.22222222222222
100	37.77777777777778

F°	C°
0	-17.77777777777778
10	-12.222222222222221
20	-6.666666666666667
30	-1.1111111111111112
40	4.444444444444445
50	10
60	15.555555555555555
70	21.11111111111111
80	26.666666666666668
90	32.22222222222222
100	37.77777777777778


## References

• Wikiversity: Computer Programming