C Program to Swap two Numbers (4 ways)

By | August 26, 2020
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In this article, you will learn to swap two numbers in C programming.

Examples :

Input : x = 10, y = 20;
Output : x = 20, y = 10

Input : x = 50, y = 100
Output : x = 100, y = 100

Algorithm :

  1. Assign x to a temp variable, i.e., temp = x
  2. Assign y to x, i.e., x = y
  3. Assign temp to y, i.e., y = temp

1. With using a Temporary Variable :

// C program to swap two variables 
#include <stdio.h> 
  
int main() 
{ 
    // take input
    int x =10, y=20; 
    printf("Before swap : %d %d\n", x, y); 
  
    // swap using temporary variable
    int temp = x; 
    x = y; 
    y = temp; 
  
    printf("After swap : %d %d\n", x, y); 
    
    // successful completion
    return 0; 
}

Output :

Before swap : 10 20
After swap : 20 10

2. Without Using Temporary Variable :

// C program to swap two variables 
#include <stdio.h> 
  
int main() 
{ 
    // take input
    int x =10, y=20; 
    printf("Before swap : %d %d\n", x, y); 
  
    x = x -y;
    y = x + y;
    x = y -x;
 
    printf("After swap : %d %d\n", x, y); 
    
    // successful completion
    return 0; 
}

Output :

Before swap : 10 20
After swap : 20 10

3. Using Bitwise operator :

// C program to swap two variables 
#include <stdio.h> 
  
int main() 
{ 
    // take input
    int x =10, y=20; 
    printf("Before swap : %d %d\n", x, y); 
  
    x = x^y;
    y = x^y;
    x = x^y;
 
    printf("After swap : %d %d\n", x, y); 
    
    // successful completion
    return 0; 
}

Output :

Before swap : 10 20
After swap : 20 10

4. Using Multiplication and Division :

// C program to swap two variables 
#include <stdio.h> 
  
int main() 
{ 
    // take input
    int x =10, y=20; 
    printf("Before swap : %d %d\n", x, y); 
  
    x = x*y;
    y = x/y;
    x = x/y;
 
    printf("After swap : %d %d\n", x, y); 
    
    // successful completion
    return 0; 
}

Output :

Before swap : 10 20
After swap : 20 10



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