38. leetcode 405. Convert a Number to Hexadecimal

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405. Convert a Number to Hexadecimal

 

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:

Input:
26
 
Output:
"1a"

Example 2:

Input:
-1
 
Output:
"ffffffff"

思路:将一个整数转换成十六进制表示的字符串。整数在计算机内部以补码表示,对于正数,直接每次取出它的后4位表示的数,可以将它和0xF相与,也可以对16取模,取完右移四位。知道数被移位成0。尤其注意负数的情况,有符号整数在C++中右移时,用符号位补足前面的位。所以,负数怎么移位它还是负数。那么就将负数处理成无符号整数,注意代码中的处理。

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