第八周项目一 复数类的运算符重载（1）

问题及代码

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*文件名称: 初学对象6

作者：李长鸿

*完成时间：2015.4.15

*问题描述： 阅读程序

*/

#include<iostream>
using namespace std;
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r; imag=i;}
Complex operator+(const Complex &c2);
Complex operator-(const Complex &c2);
Complex operator*(const Complex &c2);
Complex operator/(const Complex &c2);
void display();
private:
double real;
double imag;
};
//下面定义成员函数
Complex Complex::operator+(const Complex &c2)
{
return Complex(real+c2.real,imag+c2.imag);
}
Complex Complex::operator-(const Complex &c2)
{
return Complex(real-c2.real,imag-c2.imag);
}
Complex Complex::operator*(const Complex &c2)
{
return Complex(real*c2.real,imag*c2.imag);
}
Complex Complex::operator/(const Complex &c2)
{
return Complex(real/c2.real,imag/c2.imag);
}
void Complex::display()
{
cout<<"("<<real<<","<<imag<<")"<<endl;
}

//下面定义用于测试的main()函数
int main()
{
Complex c1(3,4),c2(5,-10),c3;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
c3=c1+c2;
cout<<"c1+c2=";
c3.display();
c3=c1-c2;
cout<<"c1-c2=";
c3.display();
c3=c1*c2;
cout<<"c1*c2=";
c3.display();
c3=c1/c2;
cout<<"c1/c2=";
c3.display();
return 0;
}

总结：返回值时，想着反正返回值是 Complex 类的，就删了一个前面的那个 Complex ，结果出现以下错误：

H:\新建文件夹\2015.4.28.1-1\main.cpp|20|error:
could not convert '(0, (((Complex*)this)->Complex::imag + ((double)c2.Complex::imag)))' from 'double' to 'Complex'|

想起老师的新定义一个 Complex 对象返回，这个不过是简化了名字而已。