[leetcode]405. Convert a Number to Hexadecimal
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题目链接:https://leetcode.com/problems/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 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.
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) { while(num>0) { hexString=hexChar[num & 0xF]+hexString; num=(unsigned)num>>4; } return hexString.empty()?"0":hexString; } private: string hexString=""; string hexChar="0123456789abcdef";};
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