405. Convert a Number to Hexadecimal （将一个数转换为16进制表示）

╰+哭是因爲堅強的太久メ 2022-07-15 01:39 198阅读 0赞

Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used.

Note:

  1. All letters in hexadecimal (a-f) must be in lowercase.
  2. The hexadecimal string must not contain extra leading 0s. If the number is zero, it is represented by a single zero character '0'; otherwise, the first character in the hexadecimal string will not be the zero character.
  3. The given number is guaranteed to fit within the range of a 32-bit signed integer.
  4. You must not use any method provided by the library which converts/formats the number to hex directly.

Example 1:

  1. Input:
  2. 26
  4. Output:
  5. "1a"

Example 2:

  1. Input:
  2. -1
  4. Output:
  5. "ffffffff"
  7. public class Solution {
  8.     public String toHex(int num) {
  9.         StringBuilder sb = new StringBuilder();
  10.         int hex;
  11.         do {
  12.             hex = num & 0x0000000f;
  13.             if (hex < 10)
  14.                 sb.insert(0, (char) (hex + '0'));
  15.             else
  16.                 sb.insert(0, (char) (hex - 10 + 'a'));
  17.             num >>>= 4;
  18.         } while (num != 0);
  19.         return sb.toString();
  20.     }
  21. }

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