Swapping two numbers
Two numbers can be swapped or interchanged. It means first number will become second and second number will become first.
For example
a = 20, b = 30
After swapping,
a = 30, b = 20
There are two methods for swapping:
- By using third variable.
- Without using third variable.
Swapping Using Third Variable
Swap two numbers 45 and 78 using a third variable.
Example:
<?php
$a = 45;
$b = 78;
// Swapping Logic
$third = $a;
$a = $b;
$b = $third;
echo "After swapping:<br><br>";
echo "a =".$a." b=".$b;
?>
Output
Swapping Without using Third Variable
Swap two numbers without using a third variable is done in two ways:
- Using arithmetic operation + and ?
- Using arithmetic operation * and /
Example for (+ and -):
<?php
$a=234;
$b=345;
//using arithmetic operation
$a=$a+$b;
$b=$a-$b;
$a=$a-$b;
echo "Value of a: $a</br>";
echo "Value of b: $b</br>";
?>
Output
Example for (* and /):
<?php
$a=234;
$b=345;
// using arithmetic operation
$a=$a*$b;
$b=$a/$b;
$a=$a/$b;
echo "Value of a: $a";
echo "Value of b: $b";
?>
Output
