Convert a Number to Hexadecimal
Given a 32-bit integer num, return a string representing its hexadecimal representation. For negative integers, two’s complement method is used.
All the letters in the answer string should be lowercase characters, and there should not be any leading zeros in the answer except for the zero itself.
Note: You are not allowed to use any built-in library method to directly solve this problem.
Example 1
Input
num = 26Output
"1a"The decimal number 26 is represented as 1a in hexadecimal.
Example 2
Input
num = -1Output
"ffffffff"Using 32-bit two’s complement, -1 is represented as ffffffff in hexadecimal.
Constraints
- -2^31 <= num <= 2^31 - 1