// intptr.c
// Illustrate integer pointers
void printab (int x, int y) { 
  printf("a=%d; b=%d\n", x, y);
}

void swap (int* x, int* y) { 
  int temp; 
  printf("x=%u; *x=%d; y=%u; *y=%d\n", x, *x, y, *y); // %u for unsigned int
  temp = *x;
  *x = *y;
  *y = temp;
  printf("x=%u; *x=%d; y=%u; *y=%d\n", x, *x, y, *y);
}

int main () { 
  int a = 1;
  int b = 2; 
  printab(a,b);
  swap(&a,&b);
  printab(a,b);
}