帮忙看下C++程序哪里错了

Question

#include<iostream>

template <class T>

class Complex
{
private:
float a,b;
public:
Complex(float r,float v)
{
a=r;
b=v;
}
int operator > (Complex q)
{
Complex w(a,b);
if((q.a+q.b)>(w.a+w.b)) return 1;
else return 0;
}

int operator < (Complex q)
{
Complex w(a,b);
if((q.a+q.b)<(w.a+w.b)) return 1;
else return 0;
}

int operator = (Complex q)
{
Complex w(a,b);
if((q.a==w.a)&&(q.b==w.b)) return 1;
else return 0;
}
void Compare(T x1,T x2)
{
if(x1>x2) cout<<"x1>x2"<<endl;
if(x1<x2) cout<<"x1<x2"<<endl;
else cout<<"x1=x2"<<endl;
}
};

int main()
{
Complex c1(2.0,3.0);
Complex c2(2.0,3.0);

Compare(Complex c1,Complex c2);

return 0;
}

Answer 1

帮你把编译错误搞没了，不知道是不是你想要的结果
#include<iostream>
class Complex
{
private:
float a,b;
public:
Complex(float r,float v)
{
a=r;
b=v;
}
int operator > (Complex q)
{
Complex w(a,b);
if((q.a+q.b)>(w.a+w.b)) return 1;
else return 0;
}

int operator < (Complex q)
{
Complex w(a,b);
if((q.a+q.b)<(w.a+w.b)) return 1;
else return 0;
}

int operator = (Complex q)
{
Complex w(a,b);
if((q.a==w.a)&&(q.b==w.b)) return 1;
else return 0;
}
};

template <class T>
void Compare(T x1,T x2)
{
if(x1>x2) std::cout<<"x1>x2"<<std::endl;
if(x1<x2) std::cout<<"x1<x2"<<std::endl;
else std::cout<<"x1=x2"<<std::endl;
}

int main()
{
Complex c1(2.0,3.0);
Complex c2(2.0,3.0);

Compare(c1,c2);

return 0;
}

追问

if(x1>x2) std::coutx2"<<std::endl;
if(x1<x2) std::cout<<"x1<x2"<<std::endl;
else std::cout<<"x1=x2"<<std::endl;

std:: 这是什么意思呢

追答

std是标准库的作用域名， cout和endl是在std的命名空间下的。 你不加可以编过，是因为有地方调用了 using std::cout; using std::endl了。

Answer 2

修改后：

#include<iostream>

using namespace std;

template <class T>

class Complex
{
private:
T a,b;
public:
Complex()
{
}

Complex(T r,T v)
{
a=r;
b=v;
}
int operator > (Complex q)
{
if((q.a+q.b)>(a+b)) return 1;
else return 0;
}

int operator < (Complex q)
{
if((q.a+q.b)<(a+b)) return 1;
else return 0;
}

int operator = (Complex q)
{
if((q.a==a)&&(q.b==b)) return 1;
else return 0;
}
void Compare(Complex<T> x2)
{
if(a>x2.a) cout<<"x1>x2"<<endl;
else if(a<x2.a) cout<<"x1<x2"<<endl;
else cout<<"x1=x2"<<endl;
}
};

int main()
{
Complex<float> c1(2.0,3.0);
Complex<float> c2(2.0,3.0);

c1.Compare(c2);

return 0;
}

Answer 3

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