#include <iostream> 
using namespace std; 
 
void box(int length, int width, int height); // box()'s prototype 
 
int main() 
{ 
  box(7, 20, 4); 
  box(50, 3, 2); 
  box(8, 6, 9); 
 
  return 0; 
} 
 
void box(int length, int width, int height) 
{ 
  cout << "volume of box is " << length * width * height << "\n"; 
}
