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-rw-r--r--convert_num_hex.py29
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diff --git a/convert_num_hex.py b/convert_num_hex.py
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+# 405. 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, nd there 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.
+"""
+
+
+class Solution(object):
+ def toHex(self, num):
+ """
+ :type num: int
+ :rtype: str
+ """
+ map, ans, num = "0123456789abcdef", "", num & 0xFFFFFFFF
+ while num:
+ ans += map[num % 16]
+ num >>= 4
+ return ans[::-1] or "0"
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.toHex(num=26))
+ print(obj.toHex(num=-1))