第十二周上机实践项目-项目1-（2）-实现复数类中的运算符重载

/*copyright(c)2016.烟台大学计算机学院
 * All rights reserved,
 * 文件名称：text.Cpp
 * 作者：刘涛
 * 完成日期：2016年5月12日
 * 版本号：vc++6.0
 *问题描述：请用类的成员函数，定义复数类重载运算符+、-、*、/，使之能用于复数的加减乘除
 */
 #include<iostream>
 using namespace std;
 class Complex
{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r; imag=i;}
    friend Complex operator+(const Complex &c1,const Complex &c2);
    friend Complex operator-(const Complex &c1,const Complex &c2);
    friend Complex operator*(const Complex &c1,const Complex &c2);
    friend Complex operator/(const Complex &c1,const Complex &c2);
    void display();
private:
    double real;
    double imag;
};
//下面定义成员函数
Complex operator+(const Complex &c1,const Complex &c2)
{
    return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
Complex operator-(const Complex &c1,const Complex &c2)
{
    return Complex(c1.real-c2.real,c1.imag-c2.imag);
}
Complex operator*(const Complex &c1,const Complex &c2)
{
    return Complex(c1.real*c2.real,c1.imag*c2.imag);
}
Complex operator/(const Complex &c1,const Complex &c2)
{
    return Complex(c1.real/c2.real,c1.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;
}

运算结果：

<img src="http://img.blog.csdn.net/20160512185345309?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

知识点总结：运用类的友元函数来实现运算符的重载。