Leetcode 405 Solution

This article provides solution to leetcode question 405 (convert-a-number-to-hexadecimal)
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https://leetcode.com/problems/convert-a-number-to-hexadecimal

Solution

class Solution {
public:
    string toHex(int num) {
        uint unum = (uint)num;

        string res;

        while (unum)
        {
            int cur = unum % 16;

            if (cur < 10)
                res += to_string(cur);
            else if (cur == 10)
                res += 'a';
            else if (cur == 11)
                res += 'b';
            else if (cur == 12)
                res += 'c';
            else if (cur == 13)
                res += 'd';
            else if (cur == 14)
                res += 'e';
            else if (cur == 15)
                res += 'f';

            unum /= 16;
        }

        reverse(res.begin(), res.end());

        return res.empty() ? "0" : res;
    }
};