【共读Primer】35.<5.2>语句作用域 Page155

 1 #include <iostream>
 2 #include <vector>
 3 
 4 using std::cout;
 5 using std::endl;
 6 
 7 std::vector<int> v = {1,2,3,4,5,6,7,8,9};
 8 
 9 
10 int get_num()
11 {
12     return 1;
13 }
14 
15 
16 
17 int main()
18 {
19     while (int i = get_num())
20         cout << i << endl;
21     i = 0;
22     
23     
24     auto beg = v.begin();
25     while (beg !=v.end() && *beg>=0)
26     {
27         ++beg;
28     }
29     if(beg == v.end())
30     {
31     
32     }
33 }