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.
";
}
complexed::complexed(double real)
{
    set(real,0.0);
    cout<<"construct called.
";
}
complexed::complexed(double real,double imag)
{
    set(real,imag);
    cout<<"constructor :real="<<real<<",imag="<<imag<<endl;
}
void complexed::display()
{
    if(imag<0)
        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=5;
    c3=complexed();
    c1.display();
    c2.display();
    c3.display();
}