#include <stdio.h>

class animal
{
public:
    animal()
    {
        init();
    }

    virtual void init()
    {}
};

class ground_hog : public animal
{
public:
    char const * appears;

    virtual void init()
    {
        appears = "Feb 2";
    }
};

int main()
{
    ground_hog x;
    printf("ground hog appears %s\n", x.appears);
}

class drink
{
public:
    // ...
    virtual bool spiked();
};

class martini : public drink
{
    double gin;
    double vermouth;

public:
    virtual bool spiked()
    {
        // ...
    }
};

int scan(drink drinks[], int n)
{
    for (int i = 0; i < n; ++i)
    {
        if (!drinks[i].spiked())
            return i;
    }

    return -1;
}

martini drinks[100];
int select = scan(drinks, 100);

B>class drink { ... };

B>class martini : public drink { ... };

B>int scan(drink drinks[], int n) { ... }

B>martini drinks[100];
B>int select = scan(drinks, 100);