#include <stdio.h>
void swapnum(int *i, int *j) {
    int temp = *i;
    *i = *j;
    *j = temp;
}

int main(void) {
    int a = 10;
    int b = 20;

    swapnum(&a, &b);
    printf("A is %d and B is %d\n", a, b);
    return 0;
}