经典问题1 ：c/c++ 程序设计 －－－赋值语句

------------------------------------------------------------------

经典问题1：c/c++ 程序设计 －－－赋值语句

-------------------------------------------------------------------

1）面试题：what does the follow program print?

1 #include <iostream>

2

3 using namespace std;

4

5 int vac = 3;

6

7 int main ()

8 {

9 int vac = 10;

10 ::vac++; //知识点：全局作用域：：3＋1＝4

11 cout<<::vac<<endl;

12 cout<<vac<<endl;

13

14 return 0;

15 }

16

----------------

result:

$ ./a.out

4

10

----------------