项目一。运算符重载

来源：互联网发布：淘宝客加入条件编辑：程序博客网时间：2024/05/21 08:46
程序：
/**（1）再定义一目运算符 -，-c相当于0-c。*（2）定义Complex类中的<<和>>运算符的重载，实现输入和输出，改造原程序中对运算结果显示方式，使程序读起来更自然。*/#include <iostream>using namespace std;class Complex{public:    Complex operator+(Complex &c2);    Complex operator-(Complex &c2);    Complex operator*(Complex &c2);    Complex operator/(Complex &c2);    friend Complex operator-(Complex &c2);    friend ostream&operator<<(ostream&,Complex&);    friend istream&operator>>(istream&,Complex&);private:    double real;    double imag;};//下面定义成员函数ostream&operator<<(ostream&output,Complex&c){    if(c.imag>=0)    {        output<<"("<<c.real<<"+"<<c.imag<<"i)"<<endl;    }    else    {        output<<"("<<c.real<<c.imag<<"i)"<<endl;    }    return output;//返回ostream类的对象}istream&operator>>(istream&input,Complex&c){    int a,b;    char sign,i;    do    {        input>>a>>sign>>b>>i;    }    while(!((sign=='+'||sign=='-')&&i=='i'));    if(sign=='-')    {        b=-b;    }    c.real=a;    c.imag=b;    return input;//返回istream类的对象}Complex Complex::operator+(Complex &c2){    Complex c;    c.real=real+c2.real;    c.imag=imag+c2.imag;    return c;}Complex Complex::operator-(Complex &c2){    Complex c;    c.real=real-c2.real;    c.imag=imag-c2.imag;    return c;}Complex Complex::operator*(Complex &c2){    Complex c;    c.real=real*c2.real-imag*c2.imag;    c.imag=c2.real*imag+real*c2.imag;    return c;}Complex Complex::operator/(Complex &c2){    Complex c;    c.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    c.imag=(c2.real*imag-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    return c;}Complex operator-(Complex &c2){    Complex c;    c.imag=-c2.imag;    c.real=-c2.real;    return c;}//下面定义用于测试的main()函数int main(){    Complex c1,c2,c3;    cout<<"please input real part and imaginary part of two complex numbers(3+4i) or (3-4i):"<<endl;    cin>>c1>>c2;    cout<<"c1="<<c1<<endl;    cout<<"c2="<<c2<<endl;    c3=c1+c2;    cout<<"c1+c2="<<c3;    c3=c1-c2;    cout<<"c1-c2="<<c3;    c3=c1*c2;    cout<<"c1*c2="<<c3;    c3=c1/c2;    cout<<"c1/c2="<<c3;    c3=-c2;    cout<<"-c2="<<c3;    return 0;}
结果：
体会：小体会了一把运算符重载
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