定义复数Complex类模板，其中包括构造函数以及显示复数的函数，最后在主函数中创建该类的2个对象用C++

#include "stdafx.h"
#include "iostream"
using namespace std;
class complex
{
public:
double a,b; //a+bi
complex(double,double);
void print();
};
complex::complex(double x,double y)
{
a=x;
b=y;
}
void complex::print()
{
cout<}
void main()
{
complex z1(3,5);
complex z2(1.9,8.7);
//输出
cout<<"z1=";z1.print();
cout<cout<<"z2=";z2.print();
cout<}

#include
using namespace std;
class complex
{
private:
double r,i;
public:
complex(double ,double);

void display();
};
complex::complex(double R=0,double I=0)
{
r=R;
i=I;
}
void complex::display()
{
cout< if(i>=0)
cout<<"+"< if(i<0)
cout<}
void main()
{
complex c1(2,3),c2(3,-3),c3(4.2,5);
c1.display();
cout< c2.display();
cout< c3.display();
cout<}