方法：先繼承類然后映射函數。
#include <iostream.h>
class animal
{
public:
animal(char thename);
};
animal::animal(char thename)
{
char name;
cout<<thename<<endl;
}
class pig:public animal //先繼承類，并在次寫上子類映射函數
{
public:
pig(char thename);
};
pig::pig(char thename):animal(thename) //后映射函數。注意父類函數此時無需再定義數據類型
{
}
class turtle:public animal
{
public:
turtle(char thename);
};
turtle::turtle(char thename):animal(thename)
{
}
int main()
{
pig st('M');
turtle sm('n');
return 0;
}