text: #include <iostream>
  
  using namespace std;
  
  // double returns a double
  // double num is the parameter
  double cube(double num){
  
      return result = num * num * num;
  
  }
  
  int main()
  {
  
      // can set a return value as a variable 
      // or just use it
      double answer = cube(5.0);
      cout << answer << endl;
      cout << cube(5.0) << endl;
  
      return 0;
  }
  
  