项目一

#include <iostream>

using namespace std;
class Complex
{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r; imag=i;}
    Complex operator+(Complex &c2);
    Complex operator-(Complex &c2);
    Complex operator*(Complex &c2);
    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)
{
    output<<"("<<c.real<<"+"<<c.imag<<"i"<<")";
    return output;
}
istream&operator>>(istream& input,Complex& c)
{
    int a,b;
    char sign,i;
    do
    {
    cout<<"请输入类似格式的复数 (3 + 2 i)"<<endl;
    input>>a>>sign>>b>>i;
    }
    while(!(sign=='+'||sign=='-')&&i=='i');
    c.real=a;
    c.imag=(sign=='+')?b:-b;
    return input;
}
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;
    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;
}
//下面定义用于测试的main()函数
int main()
{
    Complex c1(3,4),c2(5,-10),c3,c4;
    cout<<c1<<endl;
    cout<<c2<<endl;
    c3=c1+c2;
    cout<<c3<<endl;
    c3=c1-c2;
    cout<<c3<<endl;
    c3=c1*c2;
    cout<<c3<<endl;
    c3=c1/c2;
    cout<<c3<<endl;
    cin>>c4;
    cout<<c4<<endl;
    return 0;
}