9+ C Programs to Swap Numbers

This post contains a total of 9+ C Program Examples with Source Code to Swap Numbers. All these programs to Swap Numbers are made using C Programming Language.

You can use the source code of these examples with credits to the original owner.

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C Programs to Swap Numbers

1. By Gaurav Sharma

Made by Gaurav Sharma. Program to swap two number without third variable. Source

enter two number
2 3
number before swap
a=2 b=3
number after swap
a=3 b=2

#include <stdio.h>
int main() 
{
 int a,b;
 printf("enter two number\n");
 scanf("%d %d",&a,&b);
 printf("number before swap\na=%d b=%d\n",a,b);
 a=a+b;
 b=a-b;
 a=a-b;
 printf("number after swap\na=%d b=%d",a,b);

    return 0;
}

2. By Wajeeh

Made by Wajeeh. Simple C Number Swap Program. Source

Enter first number: 1
Enter second number: 2
After swapping, firstNumber = 2.00
After swapping, secondNumber = 1.00

#include <stdio.h>
int main()
{
      double firstNumber, secondNumber, temporaryVariable;

      printf("Enter first number: ");
      scanf("%lf", &firstNumber);

      printf("\nEnter second number: ");
      scanf("%lf",&secondNumber);

      // Value of firstNumber is assigned to temporaryVariable
      temporaryVariable = firstNumber;

      // Value of secondNumber is assigned to firstNumber
      firstNumber = secondNumber;

      // Value of temporaryVariable (which contains the initial value of firstNumber) is assigned to secondNumber
      secondNumber = temporaryVariable;

      printf("\nAfter swapping, firstNumber = %.2lf\n", firstNumber);
      printf("After swapping, secondNumber = %.2lf", secondNumber);

      return 0;
}

3. By Shailja Pandey

Made by Shailja Pandey. Program to swap two numbers without using variable. Source

Enter the first no. 4
Enter the second no. 5

 before swap a=4 b=5
 after swap a=5 b=4

#include <stdio.h>

int main() 
{
    int a,b;
    printf ("Enter the first no.\n");
    scanf("%d",&a);
    printf ("Enter the second no.\n");
    scanf("%d",&b);
    printf("\n before swap a=%d b=%d",a,b);
    
    a = a*b;//10*20=200
    b = a/b;//200/20=10
    a = a/b;//200/10=20
    
    system("cls");
    
    printf("\n after swap a=%d b=%d",a,b);
    return 0;
}

4. By Vijay Madankar

Made by Vijay Madankar. Program to Swap first and last digit of a number. Source

enter any number:123
number=123
swap first and last digit:321

#include <stdio.h>
#include <math.h>
int main() {
   
   int n,swap,first,last,digit;
   printf ("enter any number:");
   scanf("%d",&n);
   
   last=n%10;
   digit=(int)log10(n);
   first=(int)(n/pow(10,digit));
   swap=last;
   swap*=(int)pow(10,digit);
   swap+=n%((int)pow(10,digit));
   swap-=last;
   swap+=first;
   
  printf("\nnumber=%d",n);
 printf("\nswap first and last digit:%d",swap);
  
    return 0;
}

5. By Mahnoor Shahzad

Made by Mahnoor Shahzad. Simple Program to swap two numbers. Source

Enter 1st Number: 5 Enter 2nd Number: 6 Before swap are: 
 m= 5
 a= 6
After swap are: 
 m= 6
 a= 5

#include <stdio.h>

int main() {
    int m,a,i;
	printf("Enter 1st Number:");
	scanf("%d",&m);
	printf("Enter 2nd Number:");
	scanf("%d",&a);
	
	printf("Before swap are: \n m= %d\n a= %d\n" ,m,a);
	
    i=m;
	m=a;
	a=i;
		printf("After swap are: \n m= %d\n a= %d\n" ,m,a);
		
		
	return 0;
}

6. By Vivek harsora

Made by Vivek harsora. Number Swap program without any extra variable. Source

6 7
7 6

#include <stdio.h>

int main()
 {
   int a,b;
    
    scanf("%d %d", &a,&b);
    a = a + b;
    b = a - b;
    a = a - b;
    printf("%d %d", a, b);
    return 0;
}

7. By Vishal Gupta

Made by Vishal Gupta. C Number Swap Program using Bitwise XOR. Source

Enter two integers 8 9

 Before swapping i= 8 and k =9
 After swapping i= 9 and k = 8

#include <stdio.h>

int main() {
    long i, k;

    printf("Enter two integers \n");
    scanf("%ld %ld", &i, &k);
    printf("\n Before swapping i= %ld and k =%ld", i, k);
    i = i ^ k;
    k = i ^ k;
    i = i ^ k;
    printf("\n After swapping i= %ld and k = %ld", i, k);

    return 0;
}

8. By Ganesh

Made by Ganesh. Swap two number using function pointer. Source

Value of i and j before swap is  5 10
Value of i and j after swap is  10 5

#include <stdio.h>
void swap(int *num1,int *num2)
{
    int temp;
    temp = *num1;
    *num1 = *num2;
    *num2 =temp;
}

int main()
{
    int i = 5,j=10;
    printf("Value of i and j before swap is  %d %d\n",i,j);
    swap(&i,&j);
    
    printf("Value of i and j after swap is  %d %d\n",i,j);
}

9. By Arup Basak

Made by Arup Basak. Source

a=11,b=10

#include <stdio.h>

int main() {
 int a,b;
 scanf("%d%d",&a,&b);
 a=a+b;
 b=a-b;
 a=a-b;
 printf("\n a=%d,b=%d", a , b);
    return 0;
}

10. By Alexandros Maskas

Made by Alexandros Maskas. Source

enter 2 numbers to swap 
11

12
a is 11 and b is 12 
a is 12 and b is 11

#include <stdio.h>
int main()
{
    int a,b,temp;
    printf("enter 2 numbers to swap \n");
    scanf("%d %d",&a,&b);
    printf("a is %d and b is %d \n",a,b);
    temp=a;
    a=b;
    b=temp;
    printf("a is %d and b is %d \n",a,b);
    return 0;
}