/* main.c */

int sum(int x, int y){ 
  int t = x + y;  
  return t;  
}  

void swap(int* i, int* j){
  int temp = *i;
  *i = *j;
  *j = temp;
}

int main(){
  int a = 1;
  int b = 2;
  int c;
  swap(&a, &b);
  c = sum(a,b);
  return 0;
}