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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"
class Solution { public: string toHex(int num) { char ma[]={‘0‘,‘1‘,‘2‘,‘3‘,‘4‘,‘5‘,‘6‘,‘7‘,‘8‘,‘9‘,‘a‘,‘b‘,‘c‘,‘d‘,‘e‘,‘f‘}; string ans=""; do{ ans=ma[num & 15]+ans; //四位二进制转化成一个十六进制 num>>=4; //每次处理四位 }while(num&&ans.size()<8); return ans; } };
405. Convert a Number to Hexadecimal
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