complex类的定义、实现

 1 #include <iostream>
 2 #include <cmath>
 3 using namespace std;
 4 
 5 class complex{
 6     public:
 7         complex(double x=0,double y=0);     //注意要有默认形参值 
 8         complex(complex &p);
 9         void add(complex z);
10         double mod();
11         void show();
12     private:
13         double real,imag;
14 };
15 
16 int main()
17 {complex c1(3,5);                //用复数3+5i初始化c1 
18  complex c2(4.5);                //用实数4.5初始化c1 
19  complex c3=c1;                 //用c1初始化c3 或者写成complex c3(c1); 
20  c1.add(c2);                     //将c1和c2相加，结果保存在c1中 
21  c1.show();                      //将c1输出 
22  cout<<"|c1|="<<c1.mod()<<endl;  //输出c1的模 
23  cout<<"|c3|="<<c3.mod();        //输出c3的模 
24  return 0;
25 }
26 
27 complex::complex(double x,double y):real(x),imag(y){  //构造函数 
28 }
29 
30 complex::complex(complex &p):real(p.real),imag(p.imag){  //复制构造函数 
31 }
32 
33 void complex::add(complex z){                           //复数相加 
34     real=real+z.real;
35     imag=imag+z.imag;
36 }
37 
38 double complex::mod(){                                  //复数求模 
39     return sqrt(real*real+imag*imag);
40 }
41 
42 void complex::show(){                                   //输出复数 
43     cout<<real<<"+"<<imag<<"i"<<endl;
44 }