今天，我来学习将复数的加减乘除以及比较运算，编写一个复数类，方便计算复数之间的运算。具体用的方法就是之前写过的操作符重载的概念来实现（操作符重载的概念学习）。
那么为了显得清晰，今天写的程序运用模块化的思想：
Complex.h为：
#ifndef _COMPLEX_H_#define _COMPLEX_H_class Complex{double a;double b;public:Complex(double a = 0, double b = 0);double getA();double getB();double getModulus();Complex operator + (const Complex& c);Complex operator - (const Complex& c);Complex operator * (const Complex& c);Complex operator / (const Complex& c);bool operator == (const Complex& c);bool operator != (const Complex& c);Complex& operator = (const Complex& c);};#endif
Complex.cpp为：
#include "Complex.h"#include "math.h"Complex::Complex(double a, double b){this->a = a;this->b = b;}double Complex::getA(){return a;}double Complex::getB(){return b;}double Complex::getModulus(){return sqrt(a * a + b * b);}Complex Complex::operator + (const Complex& c){double na = a + c.a;double nb = b + c.b;Complex ret(na, nb);return ret;}Complex Complex::operator - (const Complex& c){double na = a - c.a;double nb = b - c.b;Complex ret(na, nb);return ret;}Complex Complex::operator * (const Complex& c){double na = a * c.a - b * c.b;double nb = a * c.b + b * c.a;Complex ret(na, nb);return ret;}Complex Complex::operator / (const Complex& c){double cm = c.a * c.a + c.b * c.b;double na = (a * c.a + b * c.b) / cm;double nb = (b * c.a - a * c.b) / cm;Complex ret(na, nb);return ret;}bool Complex::operator == (const Complex& c){return (a == c.a) && (b == c.b);}bool Complex::operator != (const Complex& c){return !(*this == c);}Complex& Complex::operator = (const Complex& c){if( this != &c ){a = c.a;b = c.b;}return *this;}
main.cpp为：
#include <stdio.h>#include "Complex.h"int main(){Complex c1(1, 2);Complex c2(3, 6);Complex c3 = c2 - c1;Complex c4 = c1 * c3;Complex c5 = c2 / c1;printf("c3.a = %f, c3.b = %f\n", c3.getA(), c3.getB());printf("c4.a = %f, c4.b = %f\n", c4.getA(), c4.getB());printf("c5.a = %f, c5.b = %f\n", c5.getA(), c5.getB());Complex c6(2, 4);printf("c3 == c6 : %d\n", c3 == c6);printf("c3 != c4 : %d\n", c3 != c4);(c3 = c2) = c1;printf("c1.a = %f, c1.b = %f\n", c1.getA(), c1.getB());printf("c2.a = %f, c2.b = %f\n", c2.getA(), c2.getB());printf("c3.a = %f, c3.b = %f\n", c3.getA(), c3.getB());return 0;}
以上模块代码实现了，复数的四则运算法则以及比较的法则，运用了操作符重载的概念。代码都可以通过链接直接下载得到源代码下载链接码云平台。
注意事项：
C++赋值操作符（=）只能重载为成员函数操作符重载不能改变原操作符的优先级操作符重载不能改变原操作数的个数操作符重载不能改变原操作符的语义
总结：
复数的概念可以通过自定义类实现复数中的运算操作可以通过操作符重载实现赋值操作符只能通过厂原函数实现操作符重载的本质为函数定义
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