C++课程设计类作业2

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 class complexed
 4 {
 5 public:
 6     complexed();
 7     complexed(double real);
 8     complexed(double real,double imag);
 9     void display();
10     void set(double r,double i);
11 private:
12     double real,imag;
13 };
14 complexed::complexed()
15 {
16     set(0.0,0.0);
17     cout<<"default constructor.\n";
18 }
19 complexed::complexed(double real)
20 {
21     set(real,0.0);
22     cout<<"construct called.\n";
23 }
24 complexed::complexed(double real,double imag)
25 {
26     set(real,imag);
27     cout<<"constructor :real="<<real<<",imag="<<imag<<endl;
28 }
29 void complexed::display()
30 {
31     if(imag<0)
32         cout<<real<<imag<<'i'<<endl;
33     else
34         cout<<real<<'+'<<imag<<'i'<<endl;
35 }
36 void complexed::set(double r,double i)
37 {
38     real=r;
39     imag=i;
40 }
41 int main()
42 {
43     complexed c1;
44     complexed c2(6.8);
45     complexed c3(5.6,7.9);
46     c1.display();
47     c2.display();
48     c3.display();
49     c1=complexed(1.2,3.4);
50     c2=5;
51     c3=complexed();
52     c1.display();
53     c2.display();
54     c3.display();
55 }