C Program to swap two numbers using ex-or operator:

#include <stdio.h>
int main()
{
    int a, b ;
    printf("Enter Value of a = ");
    scanf("%d", &a);
    printf("Enter Value of b = ");
    scanf("%d", &b);
    a = a ^ b; // a now becomes 30
    b = a ^ b; // b becomes 10
    a = a ^ b; // a becomes 20
    printf("After Swapping: a = %d, b = %d", a, b);
    return 0;
}

Output:

Enter Value of a = 10
Enter Value of b = 20

After Swapping: a = 20, b = 10