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Swap two variables in one line in C/C++, Python, PHP and Java
In this tutorial, we are going to learn how to swap two variables in different languages. Swapping means interchanging the values of two variables. Let's see an example.
Input
a = 3 b = 5
Output
a = 5 b = 3
Let's see one by one.
Python
We can swap the variable with one line of code in Python. Let's see the code.
Example
# initializing the variables
a, b = 3, 5
# printing before swaping
print("Before swapping:-", a, b)
# swapping
a, b = b, a
# printing after swapping
print("After swapping:-", a, b)Output
If you run the above code, then you will get the following result.
Before swapping:- 3 5 After swapping:- 5 3
In the languages like C/C++, PHP, and Java, we will use xor operator to make swapping operation easy. And it helps to complete swapping with one line of code. Let's see the steps involved in writing the program.
- Initialize the variables with two different values.
- Perform xor operation on two variables and assign the result to the first variable.
- Again perform xor operation and assign the result to the second variable.
- Again perform xor operation and assign the result to the first variable.
- The variables will be swapped.
Let's see code in different languages
C/C++
Example
# include <stdio.h>
int main() {
int a = 3, b = 5;
printf("Before Swapping:- %d %d", a, b);
(a ^= b), (b ^= a), (a ^= b);
printf("After Swapping:- %d %d", a, b);
return 0;
}Output
If you run the above code, then you will get the following result.
Before swapping:- 3 5 After swapping:- 5 3
Java
Example
class Swap {
public static void main (String[] args) {
int a = 3, b = 5;
System.out.println("Before Swapping:- " + x + " " + y);
a = a ^ b ^ (b = a);
System.out.println("After Swapping:- " + x + " " + y);
}
}Output
If you run the above code, then you will get the following result.
Before swapping:- 3 5 After swapping:- 5 3
PHP
Example
<?php $a = 5; $b = 10; echo "Before Swapping:- ", $a, " ", $b; ($a ^= $b); ($b ^= $a); ($a ^= $b); echo "After Swapping:- ", $a, " ", $b; ?>
Output
If you run the above code, then you will get the following result.
Before Swapping:- 5 10After Swapping:- 10 5
Conclusion
If you have any doubts in the tutorial, mention them in the comment section.
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