#include <stdio.h>

int maximum(int x, int y) {
  if (x > y) {
	return(x);
  } else {
	return(y);
  }
}


int main(){
  int x,y;

  x=10; y=20;
  printf("The maximum of %d and %d is %d\n",x,y,maximum(x,y));

  x=100; y=20;
  printf("The maximum of %d and %d is %d\n",x,y,maximum(x,y));

  x=10; y=10;
  printf("The maximum of %d and %d is %d\n",x,y,maximum(x,y));


  x=-10; y=-20;
  printf("The maximum of %d and %d is %d\n",x,y,maximum(x,y));


  return(0);
}