检查这个代码#include<iostream> using namespace std; class Shape { protected: int r; public: Shape(int r); virtual double surfaceArea()=0; virtual double volume()=0; }; Shpe::Shape(int r):r(r){ } class Ball:public Shape{ public: Ball(int r); double surfaceArea()override; double volume ()override; }; Ball::Ball(int r):Shape(r){ } double Ball::surfaceArea(){ return 4*3.14*r*r; } double Ball::surfaceArea(){ return 4.0/3*3.14*r*r*r; } class Cylinder:public Shape{ private: int height; public: Cylinder(int r,int height); double surfaceArea()override; double volume()override; }; Cylinder::Cylinder(int r,int height):Shape(r),height(height){ } double Cylinder::surfaceArea(){ return 2*3.14*r*r+height*2*3.14*r; } double Cylinder::volume(){ return 3.14*r*r*height; } int main(int argc,char*argv[]){ return 0; }

这段代码存在一个拼写错误，将 Shape 类的构造函数定义写成了 Shpe::Shape(int r)，应该将 Shpe 改为 Shape，即 Shape::Shape(int r)。

此外，Ball 类中的 surfaceArea 函数定义有误，应该将第二个 surfaceArea 函数改为 volume 函数。

修改后的代码如下：

#include<iostream> 
using namespace std; 

class Shape { 
	protected: 
		int r; 
	public: 
		Shape(int r); 
		virtual double surfaceArea()=0; 
		virtual double volume()=0; 
}; 

Shape::Shape(int r):r(r){ } 

class Ball:public Shape{ 
	public: 
		Ball(int r); 
		double surfaceArea()override; 
		double volume()override; 
}; 

Ball::Ball(int r):Shape(r){ } 

double Ball::surfaceArea(){ 
	return 4*3.14*r*r; 
} 

double Ball::volume(){ 
	return 4.0/3*3.14*r*r*r; 
} 

class Cylinder:public Shape{ 
	private: 
		int height; 
	public: 
		Cylinder(int r,int height); 
		double surfaceArea()override; 
		double volume()override; 
}; 

Cylinder::Cylinder(int r,int height):Shape(r),height(height){ } 

double Cylinder::surfaceArea(){ 
	return 2*3.14*r*r+height*2*3.14*r; 
} 

double Cylinder::volume(){ 
	return 3.14*r*r*height; 
} 

int main(int argc,char*argv[]){ 
	return 0; 
}