c++构造函数及其应用

#include <iostream>using namespace std;class Complex{ public: Complex(); Complex(int,int); Complex(int); Complex(const Complex & c); Complex & operator=(const Complex & r); void getValue(); private: int m_value; int m_real;};Complex::Complex(){ m_value = 2; m_real = 3;}Complex::Complex(int value,int real){ m_value = value; m_real = real;}Complex::Complex(int r){ m_value = r; m_real = -1;}Complex::Complex(const Complex & c){ m_value = c.m_value; m_real = c.m_real;}Complex & Complex::operator=(const Complex & r){ m_value = r.m_value + 1; m_real = r.m_real + 1;}void Complex::getValue(){ cout<<"my value is "<<m_value<<endl; cout<<"my real is "<<m_real<<endl;}int main(){ Complex c1,c2; //对应于 Complex(); c1.getValue(); c2.getValue(); Complex c3(5,6);//对应于Complex(int,int); c3.getValue(); Complex c4=c3;//对应于 Complex(const Complex & c); c4.getValue(); c1 = c4;//对应于Complex & operator=(const Complex & r); cout<<"focus"<<endl; c1.getValue(); Complex c5 = 90;//对应于Complex(int); c5.getValue(); return 0;}