C Programming. Program to swap two numbers using pointers.

 Program to swap two numbers using pointers.

// Program to swap two numbers using pointers.

#include<stdio.h>

int main() {

    int a, b, *p1, *p2, t;

    p1 = &a;

    p2 = &b;

    printf("Enter two numbers : ");

    scanf("%d%d",&a, &b);

    printf("Before swapping a = %d, b = %d", a, b);

    t=*p1;

    *p1=*p2;

    *p2=t;

    printf("\nAfter swapping a = %d, b = %d", a, b);

    return 0;

}

Output :

Enter two numbers : 5 7 Before swapping a = 5, b = 7 After swapping a = 7, b = 5