C++中构造函数初始化列表

          在项目中频繁见到，写个小程序，熟悉一下：

#include <iostream>
using namespace std;
 
class A
{
public:
	int a;
	
public:
	A()
	:a(0)
	{}
 
	A(int x)
	:a(x)
	{}
};
 
int main()
{
	A obj0;
	A obj1(1);
	cout << obj0.a << endl;
	cout << obj1.a << endl;
 
	return 0;
}