题解 | #构建长方体类#

#include<bits/stdc++.h>
using namespace std;
class rectangle{
	private:
		int length,width;
	public:
		rectangle(int x,int y){
			length=x;
			width=y;
		}
		void set(int x,int y){
			length=x;
			width=y;
		}
		int area(){
			return length*width;
		}
};
class cuboid:public rectangle{
	private:
		int height;
	public:
		// write your code here...
		cuboid(int x,int y,int z):rectangle(x,y ){
			this->height=z;

		}
		int getvolume(){
			return area()*height;
		}
		
};
int main(){
	int x,y,z;
	cin>>x>>y>>z;
	cuboid a(x,y,z);
	cout<<a.getvolume();
	return 0;
}

注意继承类的构造函数怎么写

cuboid(int x,int y,int z):rectangle(x,y ){

this->height=z;

}先用被继承的构造函数构造原来的变量，再定义自己独有的变量