Define a class CatalogEntry to represent a catalog entry. Each entry has an integer item number, a description that is a string, and two doubles ? a wholesale price and a retail price. Include a default constructor and the prototype of a constructor that initializes all components.

What will be an ideal response?

```
class CatalogEntry {
public:
CatalogEntry () {}
CatalogEntry ( int, const string&, double, double );
private:
int itemNumber;
string description;
double wholesalePrice;
double retailPrice;
};
]
```