48. Pointer- Swap Value

#include <stdio.h>


/*
    inplace:
        x_ := x - y
        y_ := y + x_ = y + x - y = x
        x_ := y_ - x_
*/
void swap(int *p1, int *p2) {
    // Your logic here
    *p1 = *p1 - *p2;
    *p2 = *p1 + *p2;
    *p1 = *p2 - *p1;
}

int main() {
    int a, b;
    scanf("%d %d", &a, &b);

    swap(&a, &b);

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

    return 0;
}