I have the following class :

```
class Foo
{
public:
    ...
private:
    int a;
    int b;
    int c;
    int d;
    int e;
    int f;
}

```

The program will affect a value to some of those variables and others should not be in a valid state for the logic of my program. What is a good way of handling those variables who should not have values? Should I give them a random value (ex 68823773)? This doesn't seem like a clean solution to me.