定义一个复数类COMPLEX,重载运算符“+”使之用于复数的加减运算
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class complex

{

public:

complex(double r=0,double i=0)

{

real = r;

image = i;

}

double real;

double image;

};

complex operator + (const complex& a,const complex& b)

{

return complex(a.r+b.r,a.i+b.i);

}