Question

C++问题，编写一个程序计算出球、圆柱和圆锥的表面积和体积

#include<iostream>
#include<string>
using namespace std;
#define PI 3.1415

class circle
{
public:
void information()
{
double a;
cout<<"请输入半径：";
cin>>a;
}

};

class sphere:public circle
{
public:
void first(double s1,double a)
{
double v1;
s1=4*PI*a*a;
//第一二处错误
v1=(PI*a*a*a*4)/3；
cout<<"球的表面积为:"<<s1<<endl<<"球的体积为:"<<v1<<endl;
}

};

class cylinder:public circle
{
public:
void second()
{
double s2;
double v2;
double h;
cout<<"请输入圆柱的高：";
cin>>h;
s2=2*2*PI*a*a+2*PI*a*h;
v2=2*PI*a*a*h;
cout<<"圆柱的表面积为:"<<s2<<endl<<"圆柱的体积为:"<<v2<<endl;
}

};

class cone:public circle
{
public:
void third()
{
double s3;
double v3;
double l;
cout<<"请输入圆锥的高：";
cin>>l;
s2=2*PI*a*a+PI*a*l;
v2=2*PI*a*a*l/3;
cout<<"圆锥的表面积为:"<<s2<<endl<<"圆锥的体积为:"<<v2<<endl;
}

};

void main()
{
int chose;
double a;
double h;
double l;
cin>>chose;
circle bason;
bason.information();
cout<<"请选择："<<endl<<"求球请输入1"<<endl<<"求圆柱请输入2"<<endl<<"求圆锥请输入3"<<endl;
if(chose==1)
{
sphere bason;
//第三处错误
bason.first();
}
else if(chose==2)
{
cylinder bason;
bason.second();
}
else if(chose==3)
{
cone bason;
bason.third();
}
};

出现的提示错误是：
C:\Users\bason\Desktop\zgch.cpp(25) : error C2018: unknown character '0xa3'
C:\Users\bason\Desktop\zgch.cpp(25) : error C2018: unknown character '0xbb'
C:\Users\bason\Desktop\zgch.cpp(78) : error C2660: 'first' : function does not take 0 parameters
执行 cl.exe 时出错.

求解要怎么改正啊

Answer 1

你的程序何止那几处错误，简直惨不忍睹。

我简单的修改了，编译通过了。

#include <iostream>
#include <string>
using namespace std;

#define PI 3.1415

class circle
{
public:
    void information(double & a)
    {	 
        cout<<"请输入半径：";
        cin>>a;
    }

};

class sphere:public circle
{
public:
    void first(double a)
    {
        double v1;
        double s1;
        s1=4*PI*a*a;
        //第一二处错误
        v1=(PI*a*a*a*4)/3 ;
       cout<<"球的表面积为:"<<s1<<endl<<"球的体积为:"<<v1<<endl;
    }	

};

class cylinder:public circle
{
public:
    void second(double a)
    {
        double s2;
        double v2;
        double h;
        cout<<"请输入圆柱的高：";
        cin>>h;
        s2=2*2*PI*a*a+2*PI*a*h;
        v2=2*PI*a*a*h;
        cout<<"圆柱的表面积为:"<<s2<<endl<<"圆柱的体积为:"<<v2<<endl;
    }

};

class cone:public circle
{
public:
    void third(double a)
    {
        double s2;
        double v2;
        double l;
        cout<<"请输入圆锥的高：";
        cin>>l;
        s2=2*PI*a*a+PI*a*l;
        v2=2*PI*a*a*l/3;
        cout<<"圆锥的表面积为:"<<s2<<endl<<"圆锥的体积为:"<<v2<<endl;
    }

};

void main()
{
    int chose;
    double a;
    double h;
    double l;
    cin>>chose;
    circle bason;
    bason.information(a);
    cout<<"请选择："<<endl<<"求球请输入1"<<endl<<"求圆柱请输入2"<<endl<<"求圆锥请输入3"<<endl;
    if(chose==1)
    {
        sphere bason;
        //第三处错误
        bason.first(a);
    }
    else if(chose==2)
    {
        cylinder bason;
        bason.second(a);
    }
    else if(chose==3)
    {
        cone bason;
        bason.third(a);
    }
}

Answer 2

v1=(PI*a*a*a*4)/3；
这句结束的分号应该为英文的
first()函数需要传入两个参数