#include <iostream>
using std::cout;
using std::endl;

int f( int length = 1, int width = 1, int height = 1 );

int main()
{
   cout << f();
   
   cout << f( 10 );
        
   cout << f( 10, 5 );
   
   cout << f( 10, 5, 2 ) << endl;
   return 0;
} 

int f( int length, int width, int height )
{ 
   return length * width * height;
}
