EX_1

#include<iostream>
using namespace std;
class complex
{
    private:
    double re;
    double im;
    public:
    complex()
    {
        re=0,im=0;
    }
    complex(double re,double im)
    {
        this->re=re;
        this->im=im;
    }
    void showcomplex()
    {
        cout<<re<<" + i*"<<im<<endl;
    }
    complex add(complex temcomplex )
    {
        complex newcomplex;
        newcomplex.re=this->re+temcomplex.re;
        newcomplex.im=this->im+temcomplex.im;
        return newcomplex;
    }
    complex sub(complex temcomplex)
    {
        complex newcomplex;
        newcomplex.re=this->re-temcomplex.re;
        newcomplex.im=this->im-temcomplex.im;
        return newcomplex;
    }
    complex multip(complex temcomplex)
    {
        complex newcomplex;
        newcomplex.re=(this->re)*temcomplex.re - (this->im)*temcomplex.im;
        newcomplex.im=(this->re)*temcomplex.im + (this->im)*temcomplex.re;
        return newcomplex;
    }
    complex divi(complex temcomplex)
    {
        complex newcomplex;
        double modu;
        modu=temcomplex.re*temcomplex.re+temcomplex.im*temcomplex.im;
        newcomplex.re=((this->re)*temcomplex.re + (this->im)*temcomplex.im)/modu;
        newcomplex.im=(-(this->re)*temcomplex.im +(this->im)*temcomplex.re)/modu;
        return newcomplex;
    }

};

int main()
{
    double a,b,x,y;
    cout<<"input two complex:"<<endl;
    cin>>a;
    cin>>b;
    cin>>x;
    cin>>y;
    cout<<"Z1="<<a<<" + i*"<<b<<endl;
    cout<<"Z2="<<x<<" + i*"<<y<<endl;
    complex z1(a,b),z2(x,y);
    cout<<"Z1+Z2"<<endl;
    complex z3;
    z3=z1.add(z2);
    z3.showcomplex();
    cout<<"Z1-Z2"<<endl;
    z3=z1.sub(z2);
    z3.showcomplex();
    cout<<"Z1*Z2"<<endl;
    z3=z1.multip(z2);
    z3.showcomplex();
    if(x!=0||y!=0)
    {
        cout<<"Z1/Z2"<<endl;
        z3=z1.divi(z2);
        z3.showcomplex();
    }
    else
        cout<<"Can not divide because Z2=0"<<endl;
    return 0;
}