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:
- All letters in hexadecimal (
a-f
) must be in lowercase. - The hexadecimal string must not contain extra leading
0
s. 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. - The given number is guaranteed to fit within the range of a 32-bit signed integer.
- 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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