C++问题 问题出在哪了

[tuweijian]

// 05062.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#define Pi 3.1415926
#include"iostream"
using namespace std;
class circle{
private:
double radius;
public:
circle(double r):radius(r){}
void set_radius(int r){radius=r;}
double get_radius()const {return radius;}
void show() const{
cout<<"半径:"<<radius<<endl;
}
};
class orb:public circle{
private:
double surface;
double volume;
public:
orb(double r,double s,double v):circle(r),surface(s),volume(v){
s=4*Pi*r*r;
v=(4/3)*Pi*r*r*r;}
void show()const{
circle::show();
cout<<"球的表面积:"<<surface<<endl;
cout<<"球的体积:"<<volume<<endl;
}
};

int main(int argc, char* argv[])
{
double r;
cout<<"please input a radius"<<endl;
cin>>r;
circle r1(r);
r1.show();
cout<<endl;
orb r2(r);
r2.show();

return 0;

}

[ryfdizuo]

什么问题？
要学会提问、、、

[ljt3969636]

#define Pi 3.1415926
class circle{
private:
	double radius;
public:
	circle(double r):radius(r){}
	void set_radius(int r){radius=r;}
	double get_radius()const {return radius;}
	void show() const{
		cout<<"半径:"<<radius<<endl;
	}
};
class orb:public circle{
private:
	double surface;
	double volume;
public:
	orb(double r):circle(r),surface(4*Pi*r*r),volume((4/3)*Pi*r*r*r){
		}
	void show()const{
		circle::show();
		cout<<"球的表面积:"<<surface<<endl;
		cout<<"球的体积:"<<volume<<endl;
	}
};


int main(int argc, char* argv[])
{
double r;
cout<<"please input a radius"<<endl;
cin>>r;
circle r1(r);
r1.show();
cout<<endl;
orb r2(r);
r2.show();

return 0;

}

[ljt3969636]

[Quote=引用 1 楼 dizuo 的回复:]

什么问题？
要学会提问、、、
[/Quote]

习惯就好，逐渐培养我们猜的能力.......

[xiaolomg]

[Quote=引用 3 楼 ljt3969636 的回复:]

引用 1 楼 dizuo 的回复:

什么问题？
要学会提问、、、


习惯就好，逐渐培养我们猜的能力.......
[/Quote]
给力！但您也说说是什么问题啊

[xiaolomg]

[Quote=引用 2 楼 ljt3969636 的回复:]

C/C++ code

#define Pi 3.1415926
class circle{
private:
double radius;
public:
circle(double r):radius(r){}
void set_radius(int r){radius=r;}
double get_radius()const {return radius;……
[/Quote]
这个是正解！

[Freedom]

没有明白

[xspace_time]

未知数初始化一般无意义
#define Pi 3.1415926
#include"iostream"
using namespace std;
class circle{
private:
double radius;
public:
circle(double r):radius(r){}
void set_radius(int r){radius=r;}
double get_radius()const {return radius;}
void show() const{
cout<<"半径:"<<radius<<endl;
}
};
class orb:public circle{
private:
double surface;
double volume;
public:
orb(double r):circle(r)
{
surface=4*Pi*r*r;
volume=(4/3)*Pi*r*r*r;}
void show()const{
circle::show();
cout<<"球的表面积:"<<surface<<endl;
cout<<"球的体积:"<<volume<<endl;
}
};

int main(int argc, char* argv[])
{
double r;
cout<<"please input a radius"<<endl;
cin>>r;
circle r1(r);
r1.show();
cout<<endl;
orb r2(r);
r2.show();
return 0;
}
或者
#define Pi 3.1415926
#include"iostream"
using namespace std;
class circle{
private:
double radius;
public:
circle(double r):radius(r){}
void set_radius(int r){radius=r;}
double get_radius()const {return radius;}
void show() const{
cout<<"半径:"<<radius<<endl;
}
};
class orb:public circle{
private:
double surface;
double volume;
public:
orb(double r,double s,double v):circle(r),surface(s),volume(v){
surface=4*Pi*r*r;//使用s参数求surface时,对surface(s)函数才有意义
volume=(4/3)*Pi*r*r*r;}
void show()const{
circle::show();
cout<<"球的表面积:"<<surface<<endl;
cout<<"球的体积:"<<volume<<endl;
}
};

int main(int argc, char* argv[])
{
double r;
cout<<"please input a radius"<<endl;
cin>>r;
circle r1(r);
r1.show();
cout<<endl;
orb r2(r,0,0);
r2.show();
return 0;
}
或者
#define Pi 3.1415926
#include"iostream"
using namespace std;
class circle{
private:
double radius;
public:
circle(double r):radius(r){}
void set_radius(int r){radius=r;}
double get_radius()const {return radius;}
void show() const{
cout<<"半径:"<<radius<<endl;
}
};
class orb:public circle{
private:
double surface;
double volume;
public:
orb(double r,double s,double v):circle(r),surface(s),volume(v){
surface=4*Pi*s*s;
volume=(4/3)*Pi*v*v*v;}
void show()const{
circle::show();
cout<<"球的表面积:"<<surface<<endl;
cout<<"球的体积:"<<volume<<endl;
}
};

int main(int argc, char* argv[])
{
double r;
cout<<"please input a radius"<<endl;
cin>>r;
circle r1(r);
r1.show();
cout<<endl;
orb r2(r,r,r);
r2.show();
return 0;
}

[cllan_jim]

什么问题？
要学会提问、、

[alweeq86]

//构造函数有问题
orb(double r):circle(r)
{
		surface=4*Pi*r*r;
		volume=(4/3)*Pi*r*r*r;
}