自己定义一个复数类型，可以进行复数的基本运算
#include<iostream>
using namespace std;
struct complex
{
double real,imag;
complex(double r=0.0,double i=0.0):real(r),imag(i){};
complex operator+ (const complex & other)const
{
return complex(real+other.real,imag+other.imag);
}
complex operator- (const complex &other)const
{
return complex(real-other.real,imag-other.imag);
}
complex operator* (const complex &other)const
{
return complex(real*other.real-imag*other.imag,real*other.imag+other.real*imag);
}
};
ostream& operator<<(ostream& os,const complex&c){if(c.imag>=0){os<<c.real<<"+"<<c.imag<<"i";}
else{os<<c.real<<c.imag<<"i";}return os;}
istream& operator >>(istream& is, complex &c){is>>c.real>>c.imag;return is;}
int main()
{
complex a,b;
cin>>a>>b;
cout<<a+b<<'\n';
cout<<a-b<<'\n';
cout<<a*b<<'\n';
}