default constructor

 1 #include <iostream>
 2 #include <vector>
 3 
 4 using namespace std;
 5 
 6 class B {
 7 public:
 8     int b;
 9     B() {b=2;}
10 };
11 
12 class A {
13 public:
14     int a;
15     B b;
16 };
17 int main() 
18 {
19     vector<int> iv(10);
20     cout << iv.begin()-iv.end();
21 
22     A test;
23     cout << test.b.b;
24     cout << test.a;
25 }

posted on 2014-05-06 18:59 aoun 阅读(138) 评论(0) 收藏举报