转换构造函数

转换构造函数

#include <iostream>
using namespace std;
class complex
{
public:
	void display();
	void set_value();
	complex():real(0),imag(0){}
	complex(int r,int i):real(r),imag(i){};
	~complex(){cout<<real<<"执行了析构函数"<<endl;}
	complex(const complex &t){real=t.real;imag=t.imag;cout<<"执行了复制构造函数"<<endl;}
	//转换构造函数
	complex(double r){real=r;imag=0;}
	friend complex operator+(const complex&,const complex&);
private:
	int real;
	int imag;
};
void complex::display()
{
	cout<<"("<<real<<","<<imag<<")"<<endl;
}
void complex::set_value()
{
	cout<<"Please enter the real and imag."<<endl;
	cin>>real>>imag;
}
complex operator+(const complex&c1,const complex&c2)
{
	return complex(c1.real+c2.real,c1.imag+c2.imag);
}
int main()
{
	complex t1,t2,t3,t4,t5;
	t1.set_value();
	t1.display();//1,1
	t2=2;
	t2.display();//2,0
	t3.set_value();
	t3.display();//3,3
	t4=t1+t3;
	t4.display();//4,4
	t5=t4+1;
	t5.display();//5,4
}

结果