C++课程设计类作业2

不要问我一个晚上在干啥，就写写这种烦到极点的类，啰嗦！

 #include <bits/stdc++.h>
 using namespace std;
 class complexed
 {
 public:
     complexed();
     complexed(double real);
     complexed(double real,double imag);
     void display();
     void set(double r,double i);
 private:
     double real,imag;
 };
 complexed::complexed()
 {
     set(0.0,0.0);
     cout<<"default constructor.\n";
 }
 complexed::complexed(double real)
 {
     set(real,0.0);
     cout<<"construct called.\n";
 }
 complexed::complexed(double real,double imag)
 {
     set(real,imag);
     cout<<"constructor :real="<<real<<",imag="<<imag<<endl;
 }
 void complexed::display()
 {
     if(imag<)
         cout<<real<<imag<<'i'<<endl;
     else
         cout<<real<<'+'<<imag<<'i'<<endl;
 }
 void complexed::set(double r,double i)
 {
     real=r;
     imag=i;
 }
 int main()
 {
     complexed c1;
     complexed c2(6.8);
     complexed c3(5.6,7.9);
     c1.display();
     c2.display();
     c3.display();
     c1=complexed(1.2,3.4);
     c2=;
     c3=complexed();
     c1.display();
     c2.display();
     c3.display();
 }