The main method calls the `twice()` method. The `twice()` method calls the `triple()` and `quadruple()` method. For some reason they aren't printing. Please let me know what I need to fix?

```
using namespace std;

class firstClass{
public:
        double twice(int g){
            double result = g*2;
            triple(g);
            quadruple(g);
            return result;
        }
        double triple(int g){
            double result = g*3;
            cout<< result;
        }
         double quadruple(int g){
            double result = g*4;
            cout<< result;
        }
};

int main(){
    cout<<"Please enter a number you'd like to multiply";
    double a;
    cin>>a;
    double g;
    double twice(a);

return 0;
}

```