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g0401_0500.s0405_convert_a_number_to_hexadecimal.readme.md Maven / Gradle / Ivy

405\. Convert a Number to Hexadecimal

Easy

Given an integer `num`, return _a string representing its hexadecimal representation_. For negative integers, [two’s complement](https://en.wikipedia.org/wiki/Two%27s_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 = 26

**Output:** "1a" 

**Example 2:**

**Input:** num = -1

**Output:** "ffffffff" 

**Constraints:**

*   -231 <= num <= 231 - 1