Question

定义一个复数类Complex,重载运算符"+",使之能用于复数的加法运算.

要求：分别用成员函数和全局函数重载两种方法实现。

Answer 1

所谓全局函数，就是用友元来实现。 多说无益 看代码吧：
class COMPLEX
{
private:
double realPart,imagePart;
public:
friend COMPLEX operator + (COMPLEX &a,COMPLEX &b);
};
COMPLEX operator + (COMPLEX &a,COMPLEX &b)
{
COMPLEX temp;
temp.realPart=a.realPart+b.realPart;
temp.imagePart=a.imagePart+b.imagePart;
return temp;
}
/////////////////////////////////
class COMPLEX1
{
private:
double realPart,imagePart;
public:
COMPLEX1 operator + (COMPLEX1 &a);
};
COMPLEX1 COMPLEX1::operator + (COMPLEX1 &a)
{
COMPLEX1 temp;
temp.realPart=a.realPart+realPart;
temp.imagePart=a.imagePart+imagePart;
return temp;
}