【字符串】面试题 05.02. 二进制数转字符串

 1 class Solution {
 2 public:
 3     string printBin(double num) 
 4     {
 5         string res = "0.";
 6 
 7         // 若 "0." 计为两位，i 初始化为 30，若计为 1 位，初始化为 31
 8         int i = 30; 
 9 
10         while (num > 0 && i--) 
11         {
12             num *= 2;
13             if (num >= 1) 
14             {
15                 res.push_back(‘1‘);
16                 --num;
17             }
18             else 
19             {
20                 res.push_back(‘0‘);
21             }
22         }
23         return num != 0 ? "ERROR" : res;
24     }
25 };