easy way to solve the problem

void update(int *a,int *b) { // Complete this function

    int sum , diff;
sum = *a + *b;

diff = *a - *b;
if (diff < 0) diff = -(diff);

*a = sum;
*b = diff;

}

int main() {

    int a, b;
int *pa = &a, *pb = &b;

scanf("%d %d", &a, &b);
update(pa, pb);
printf("%d\n%d", a, b);

return 0;

}