HackerRank -Pointers in C (C Language)

Operations on pointers-finds the sum and difference between numbers given.

 #include <stdio.h>

void update(int* a , int* b) {

    int temp = *a;

    *a = temp + *b;

    *b = temp - *b;

    if (*b < 0)

    {

        *b *= (-1);

    }

}

int main() {

    int a , b;

    int* pa = &a , * pb = &b;

    printf("Enter two Numbers : ");

    scanf("%d %d" , &a , &b);

    update(pa , pb);

    printf(" sum : %d\n Difference : %d" , a , b);

    return 0;

}