C++实现复数四则运算

#include
//using namespace std;
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i):real(r),imag(i){}

friend istream& operator>>(istream&,Complex&);//友元函数，用来输入复数
friend ostream& operator<<(ostream&,Complex&);//友元函数，用来输出复数

friend Complex operator+(Complex &c1,Complex &c2);//重载加法友元函数声明
friend Complex operator-(Complex &c1,Complex &c2);//重载减法友元函数声明
friend Complex operator*(Complex &c1,Complex &c2);//重载乘法友元函数声明
friend Complex operator/(Complex &c1,Complex &c2);//重载除法友元函数声明
private:
double real;
double imag;
};

istream & operator>>(istream &input,Complex &c)
{
cout<<"请输入复数的实部:";
input>>c.real;
cout<<"请输入复数的虚部:";
input>>c.imag;
return input;
}
ostream & operator<<(ostream &output,Complex &c)
{
if(c.real==0&&c.imag==0)
{
output<<0;
}
else
if(c.real==0&&c.imag!=0)
{
output<}
else
if(c.real!=0&&c.imag==0)
{
output<}
else
if(c.imag==1)
{
output<}
else
if(c.imag==-1)
{
output<}
else
if(c.imag>0)
{
output<}
else
if(c.imag<0)
{
output<}
return output;
}

Complex operator +(Complex &c1,Complex &c2)
{
return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
Complex operator-(Complex &c1,Complex &c2)
{
return Complex(c1.real-c2.real,c1.imag-c2.imag);
}
Complex operator*(Complex &c1,Complex &c2)
{
return Complex(c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c1.imag*c2.real);
}
Complex operator/(Complex &c1,Complex &c2)
{
return
Complex((c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag),(c2.real*c1.imag-
c1.real*c2.imag)/(c2.real*c2.real +c2.imag*c2.imag));
}

void suan(Complex &c1,Complex &c2,Complex &c3)
{
int flag=1;
char c;
cout<<"菜单:"<cout<<"1.输入复数1"<cout<<"2.输入复数2"<cout<<"+.进行复数相加运算"<cout<<"-.进行复数相减运算"<cout<<"*.进行复数相乘运算"<cout<<"/.进行复数相除运算"<cout<<"0.退出"<while(flag)
{
cout<<"请选择操作:"<cin>>c;
switch (c)
{
case '1':cin>>c1;cout<<"您输入的复数是:"<case '2':cin>>c2;cout<<"您输入的复数是:"<case '+':c3=c1+c2;cout<<"("<case '-':c3=c1-c2;cout<<"("<case '*':c3=c1*c2;cout<<"("<case '/':c3=c1/c2;cout<<"("<}
}
}
int main()
{
Complex c1,c2,c3;
suan(c1,c2,c3);
return 0;
}