/* 
 * these two lines are needed due to the declaration-before-use rule!
 * without them, the compiler will not recognize cout and endl.
 */
#include <iostream>
using namespace std;

// these two lines are needed due to the declaration-before-use rule (Square and Cube)!
int Square (int n);
int Cube (int n);

int main(){
cout<<"The square of 9 is "<<Square(9)<<'.'<<endl;
cout<<"The square of 19 is "<<Square(19)<<'.'<<endl;
return 0;
}

int Square(int n){
return n * n;
}

int Cube(int n){
return n * n * n;
}