complex类

//主文件m.cpp

#include <iostream>
#include "complex.h"
using namespace std;
void main()
{
 double f;
 complex c1(1,1);
 f=c1.abs();
 cout<<f<<endl;
}
//complex.h

#if !defined complex_h
#define complex_h
class complex
{
 double real;
 double image;
public:
 complex();
 complex(double,double);
 complex(const complex&);//拷贝构造函数
 double abs();
};                                                                                                                                                                             #endif
//complex.cpp

#include "complex.h"
#include <cmath>
complex::complex()
{
 real=0;
 image=0;
}
complex::complex(double r,double i)
{
 real=r;
 image=i;
}
complex::complex(const complex&c)
{
 real=c.real;
 image=c.image;
}
double complex::abs()
{
 return sqrt(real*real+image*image);
}