Question

下面代码在VC中执行报出一个错误，我没找到请高手指点

#include<iostream.h>
class CCircle;

struct CPoint
{
unsigned x;
unsigned y;
bool IsInCircle(CCircle*Circle);
};
class CCircle
{
public;
unsigned Radius;
CPoint Center;
};
bool CPiont::IsInCircle(CCircle*Circle)//这段代码定义不是理解请高手详细解释下
{
return (((x-Circle->Center.x)*(x-Circle->Center.x)
+(y-Circle->Center.y)*(y-Circle->Center.y)
)
<=Circle->Radius*Circle->Radius
);
};
void main()
{
CPoint Center;
CPoint Point;
CCircle Circle;

Center x=0
CPiont Point;
CCircle Circle;

Center.x=0;
Center.y=0;
Point.x=2;
Point.y=3;
Circle.Radius=3;
Circle.Center=Center;
if(Point.IsInCircle(&Circle))
cout<<"The point is in the circle."<<endl;
else
cout<<"The point is not in the circle."<<endl;

}

Answer 1

#include<iostream.h>

class CCircle;

class CPoint
{
public:
unsigned x;
unsigned y;
bool IsInCircle(CCircle*Circle);
};
class CCircle
{
public:
unsigned Radius;
CPoint Center;
};
bool CPoint::IsInCircle(CCircle*Circle)
{
return (((x-Circle->Center.x)*(x-Circle->Center.x)
+(y-Circle->Center.y)*(y-Circle->Center.y)
)
<=Circle->Radius*Circle->Radius
);
};
void main()
{
CPoint Center;
CPoint Point;
CCircle Circle;

Center.x=0;
Center.y=0;
Point.x=2;
Point.y=3;
Circle.Radius=3;
Circle.Center=Center;
if(Point.IsInCircle(&Circle))
cout<<"The point is in the circle."<<endl;
else
cout<<"The point is not in the circle."<<endl;

}

帮你把代码改好了，能够运行了，平时注意的你拼写问题~~~有什么不明白的，可以继续追问~~

追问

我这段代码中主要那里出错了，你改了哪里，还有这段：
bool CPoint::IsInCircle(CCircle*Circle)
{
return (((x-Circle->Center.x)*(x-Circle->Center.x)
+(y-Circle->Center.y)*(y-Circle->Center.y)
)
Radius*Circle->Radius
);
};
麻烦你给详细解释下代码的每句的意思和作用谢谢

追答

知道怎么判断一个坐标点是否在一个圆内么？
x^2+y^2Center.x)*(x-Circle->Center.x)
+(y-Circle->Center.y)*(y-Circle->Center.y)
)
Radius*Circle->Radius
);
成立，则说明点在圆内……就这么简单而已，这只有一句话……

至于说，我改了哪些地方，自己对照着看看不就懂了？

Answer 2

IsInCircle函数在计算那个点是否在圆内，x的平方加上y的平方，如果大于半径的平方就在圆外返回0，如果小于就返回1
错误应该出现在下面几句里;
CPoint Center;
CPoint Point;
CCircle Circle;

Center x=0
CPiont Point;//重复定义
CCircle Circle;//重复定义
很明显你重复定义了呀

Answer 3

IsInCircle在圆内的话，根据解析几何知识 (x-x0)^2 +(y-y0)^2 <=r^2;

错误应该是
public; ==》public: 分号与冒号搞错了

Answer 4

Center x=0
main()里的这句

Answer 5

报什么错贴出来啊