定义一个复数类Complex，重载运算符“+”、“-”、“*”、“/”，使之能用于复数的加、减、乘、除。要求：将“+”和“-”的运算符重载函数作为Complex的成员函数；将“*”和“/” 的运算符重载函数作为友元函数。编写程序，分别求两个复数之和、差、积、商。

提示：若已知c1=a+bi，c2=c+di，则：

c1+c2=(a+c)+(b+d)i

c1-c2=(a-c)+(b-d)i

c1*c2=(ac-bd)+(ad+bc)i

c1/c2=(ac+bd)/(c*c+d*d)+((bc-ad)/( c*c+d*d))i

运行结果参考如下：

下面是代码

#include

using namespace std;

class Complex {

public :

Complex (double x=0,double y=0):real(x),imag(y) {}

friend Complex operator * (Complex &c1,Complex &c2);

friend Complex operator / (Complex &c1,Complex &c2);

Complex operator + (Complex &c2 );

Complex operator - (Complex &c2 );

void display();

private :

double real;

double imag;

};

Complex operator * (Complex &c1,Complex &c2) {

return Complex (c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c1.imag*c2.real);

}

Complex operator / (Complex &c1,Complex &c2) {

Complex c;

c.real=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);

c.imag=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);

return c;

}

Complex Complex ::operator + (Complex &c2) {

return Complex (real+c2.real,imag+c2.imag);

}

Complex Complex ::operator - (Complex &c2) {

return Complex (real-c2.real,imag-c2.imag);

}

void Complex ::display() {

cout<"<

}

int main() {

Complex c1(3,4),c2(5,-10),c3;

c1.display();

c2.display();

c3=c1+c2;

c3.display();

c3=c1-c2;

c3.display();

c3=c1*c2;

c3.display();

c3=c1/c2;

c3.display();

return 0;

}

出现过的问题，

1.

Complex (double x=0,double y=0):real(x),imag(y){}

参数初始化表这里需要对x，y赋初值，不然c3在编译时会报错；

2.

must take either zero or one argument

出现这个问题也困扰了我很久

二元运算符用成员重载时,   只需要一个参数,   另一个参数由this指针传入 (第一个参数由this指针自动传入到函数中去的.)

Complex operator + (Complex &c1,Complex &c2 );

所以这样写是不对的