Question

c++重载运算符>><<出现问题

>>,<<运算符重载输入的数为什么输出时有错，调试无错？
#include<iostream.h>
class complex
{
private:
float real,image;
public:
complex(float r=0,float i=0){ real=r;image=i;}

friend ostream &operator<<(ostream&s,complex c)
{
s<<c.real<<"+";
s<<c.image<<"i"<<endl;
return s;
}
friend istream &operator>>(istream&s,complex c)
{
s>>c.real;
s>>c.image;
return s;
}
};
void main()
{
complex a,b;
cin>>a>>b;
cout<<a<<b;
}

Answer 1

friend istream &operator>>(istream&s,complex c)这里如果complex c,c的前面不加&的话在子函数里修改的值不能传到c里。只是简单的传值调用而已。

friend ostream &operator<<(ostream&s,complex c)这个子函数不知道你要干什么但估计是要输出两个数值的和，所以帮你进行了以下修改。

#include<iostream.h>
class complex
{
private:
float real,image;
public:
complex(float r=0,float i=0){ real=r;image=i;}

friend ostream &operator<<(ostream&s,complex c)
{
s<<c.real<<"+";
s<<c.image<<"="<<c.image+c.real<<endl;
return s;
}
friend istream& operator>>(istream& s,complex &c)
{
s>>c.real;
s>>c.image;
return s;
}
};
void main()
{
complex a,b;
cin>>a>>b;
cout<<a<<b;
}