Programming Fundamentals/Conditions/PHP
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conditions.php
[edit | edit source]<?php
// This program asks the user to select Fahrenheit or Celsius conversion
// and input a given temperature. Then the program converts the given
// temperature and displays the result.
//
// References:
// https://www.mathsisfun.com/temperature-conversion.html
// https://en.wikibooks.org/wiki/PHP_Programming
function get_choice()
{
printf("Enter F to convert to Fahrenheit or C to convert to Celsius: ");
$choice = readline();
return $choice;
}
function process_celsius()
{
$temperature = get_temperature("Fahrenheit");
$result = calculate_celsius($temperature);
display_result($temperature, "Fahrenheit", $result, "Celsius");
}
function process_fahrenheit()
{
$temperature = get_temperature("Celsius");
$result = calculate_fahrenheit($temperature);
display_result($temperature, "Celsius", $result, "Fahrenheit");
}
function get_temperature($label)
{
echo "Enter " . $label . " temperature: ";
$temperature = readline();
return $temperature;
}
function calculate_celsius($fahrenheit)
{
$celsius = ($fahrenheit - 32) * 5 / 9;
return $celsius;
}
function calculate_fahrenheit($celsius)
{
$fahrenheit = $celsius * 9 / 5 + 32;
return $fahrenheit;
}
function display_result($temperature, $from_label, $result, $to_label)
{
echo $temperature . "° " . $from_label . " is " . $result . "° " . $to_label . "\n";
}
function main()
{
// main could either be an if-else structure or a switch-case structure
$choice = get_choice();
// if-else approach
if($choice == 'C' || $choice == 'c')
{
process_celsius();
}
else if($choice == 'F' || $choice == 'f')
{
process_fahrenheit();
}
else
{
echo "You must enter C to convert to Celsius or F to convert to Fahrenheit!";
}
// switch-case approach
switch($choice)
{
case 'C':
case 'c':
process_celsius();
break;
case 'F':
case 'f':
process_fahrenheit();
break;
default:
echo "You must enter C to convert to Celsius or F to convert to Fahrenheit!";
}
}
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 PHP compiler / interpreter / IDE.