为什么是非法指针运算在 main 函数中

[jxjasap520]

void main()
{
float radius;
float PenCeCost,ConCreateCost;
//设定浮点数输出时只显示小数点后两位
cout.self(ios::fixed);
cout.self(ios::showpoint);
cout.precision(2);
//提示用户输入半径
cout << "Enter the radius of pool:";
cin >> radius;
//定义Ｃircle对象
Circle Pool(radius);
Circle PoolRim(radius+3);
PenCeCost=PoolRim.Circumference()*FencerPrice;
cout << "Fencing cost is $" << PenCeCost << endl;
ConCreateCost=(PoolRim.Area()-Pool.Area())*ConCreatePrice;
cout << "ConCreate Cost is $" << ConCreateCost << endl;
}

[oyljerry]

错误位置?

[llf_hust]

#include <iostream>
using namespace std;
const double PI=3.14152;
const float FencerPrice=3.50;
const float ConCreatePrice=0.50;

//声明类Circle及其数据和方法
class Circle
{
private:
float radius;//定义圆的半径
public:
Circle(float r);//构造函数
float Circumference(void) const;
float Area(void) const;
};
//类的实现
//构造函数用类来初始化数据成员radius
Circle::Circle(float r):radius(r)
{}
//计算圆的周长
float Circle::Circumference(void)const
{
return 2*PI*radius;
}

//计算圆的面积
float Circle::Area(void) const
{
return PI*radius*radius;
}
void main()
{
float radius;
float PenCeCost,ConCreateCost;
//设定浮点数输出时只显示小数点后两位
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2);
//提示用户输入半径
cout << "Enter the radius of pool:";
cin >> radius;
//定义Ｃircle对象
Circle Pool(radius);
Circle PoolRim(radius+3);
PenCeCost=PoolRim.Circumference()*FencerPrice;
cout << "Fencing cost is $" << PenCeCost << endl;
ConCreateCost=(PoolRim.Area()-Pool.Area())*ConCreatePrice;
cout << "ConCreate Cost is $" << ConCreateCost << endl;
}

[llf_hust]

你贴的代码好像不完整吧

[darkstar21cn]

讨论了下问题，让你占了一楼。
可惜楼主不在，到现在还没补全

[jxjasap520]

#include <iostream>

const float PI=3.14152;
const float FencerPrice=3.50;
const float ConCreatePrice=0.50;

//声明类Circle及其数据和方法
class Circle
{
private:
float radius;//定义圆的半径
public:
Circle(float r);//构造函数
float Circumference(void) const;
float Area(void) const;
};
//类的实现
//构造函数用类来初始化数据成员radius
Circle::Circle(float r):radius(r)
{}
//计算圆的周长
float Circle::Circumference(void)const
{
return 2*PI*radius;
}

//计算圆的面积
float Circle::Area(void) const
{
return PI*radius*radius;
}

[atgjplh]

楼上的是对的