课后习题改错实在有几个找不出

#include
#include
using namespace std;
class point
{
public:
void set(double ix,double iy)
{
x=ix;
y=iy;
}
double xOffset()
{
return x;
}
double yOffset()
{
return y;
}
double ngle()
{
return(180/3.14159)atan2(y,x);
}
double radius()
{
return sqrt(xx+y*y);
}
proteced:
double x;
double y;
};
int main()
{
point p;
double x,y;
cout<<"enter x and y:\n";
cin>>x>>y;
p.set(x,y);
p.x+=5;
p.y+=6;
cout<<"angle="<<p.ngle()
<<",radius="<<p.radius()
<<",x offset="<<p.xOffset()
<<",y offset="<<p.yOffset()<<endl;
}

protected: 是 保护成员 x,y属性在外面不能访问
protected: 改成 public: 即可

你题目的解答代码如下：

#include <iostream>
#include <cmath>
using namespace std;
class point
{
public:
    void set(double ix, double iy)
    {
        x = ix;
        y = iy;
    }
    double xOffset()
    {
        return x;
    }
    double yOffset()
    {
        return y;
    }
    double ngle()
    {
        return (180 / 3.14159) * atan2(y, x);
    }
    double radius()
    {
        return sqrt(x * x + y * y);
    }
public:  // x,y改成公有成员
    double x;
    double y;
};
int main()
{
    point p;
    double x, y;
    cout << "enter x and y:\n";
    cin >> x >> y;
    p.set(x, y);
    p.x += 5;
    p.y += 6;
    cout << "angle=" << p.ngle()
         << ",radius=" << p.radius()
         << ",x offset=" << p.xOffset()
         << ",y offset=" << p.yOffset() << endl;

}

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