Swap Two Numbers Using Pointers In C

In this post, we are going to make a program in C to Swap two numbers using Pointers. 

Algorithm

1. Declare K and L  with Pointers

2. Printing Before Swap Numbers 

3. Using Formula to Swap with Pointers

4. Printing After Swap Numbers

Code

#include <stdio.h>
int main()
{
int k=10,l=20,*p1=&k,*p2=&l;

printf("Before swap : *p1=%d *p2=%d",*p1,*p2);
*p1=*p1+*p2;
*p2=*p1-*p2;
*p1=*p1-*p2;
printf("\n After swap : *p1=%d *p2=%d",*p1,*p2);
return 0;
}

Output

Before swap : *p1=10 *p2=20
 After swap : *p1=20 *p2=10