number swapping

 #include <stdio.h>

void swap(int *x, int *y);

int main()

{

    int a = 3, b = 4;

    printf("The value of a and b before swap is:%d and %d\n", a, b);

    swap(&a, &b);

    printf("The value of a and b after swap is:%d and %d\n", a, b);

    return 0;

}

void swap(int *x, int *y)

{

    int temp;

    temp = *x;

    *x = *y;

    *y = temp;

    return;

}