继承zheng如何添加height数据成员

#include<iostream>
using namespace std;
class zheng
{	int side;
public:
	void setside(int s) {
		side = s;
	}
	float getArea() { return side * side; }
};
class fang :public zheng {
	int side;
	int hieght;
public:
	void sethieght(int h) {
		hieght = h;
	}
	float gettiji() { return side * side * height; }

};
void main()
{
	zheng s;
	s.setside(2);
	cout << s.getArea();
	fang f;
	f.setheight(2);
	cout << f.gettiji();
}

height 和hieght  还有seteight和sethieght 拼写