text: // https://www.hackerrank.com/challenges/c-tutorial-pointer
  
  #include <stdio.h>
  #include <stdlib.h>
  
  void update(int *a,int *b) {
      int temp = *a;
      (*a) = (*a) + (*b);
      (*b) = abs(temp-(*b));
  }
  
  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;
  }
  