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lines changed Original file line number Diff line number Diff line change 1+ hex_table = {hex(i)[2:]: i for i in range(16)} # Use [:2] to strip off the leading '0x'
2+
3+
4+ def hex_to_decimal(hex_string: str) -> int:
5+ """
6+ Convert a hexadecimal value to its decimal equivalent
7+ #https://www.programiz.com/python-programming/methods/built-in/hex
8+
9+ >>> hex_to_decimal("a")
10+ 10
11+ >>> hex_to_decimal("12f")
12+ 303
13+ >>> hex_to_decimal(" 12f ")
14+ 303
15+ >>> hex_to_decimal("FfFf")
16+ 65535
17+ >>> hex_to_decimal("-Ff")
18+ -255
19+ >>> hex_to_decimal("F-f")
20+ ValueError: Non-hexadecimal value was passed to the function
21+ >>> hex_to_decimal("")
22+ ValueError: Empty string value was passed to the function
23+ >>> hex_to_decimal("12m")
24+ ValueError: Non-hexadecimal value was passed to the function
25+ """
26+ hex_string = hex_string.strip().lower()
27+ if not hex_string:
28+ raise ValueError("Empty string was passed to the function")
29+ is_negative = hex_string[0] == "-"
30+ if is_negative:
31+ hex_string = hex_string[1:]
32+ if not all(char in hex_table for char in hex_string):
33+ raise ValueError("Non-hexadecimal value was passed to the function")
34+ decimal_number = 0
35+ for char in hex_string:
36+ decimal_number = 16 * decimal_number + hex_table[char]
37+ if is_negative:
38+ decimal_number = -decimal_number
39+ return decimal_number
40+
41+
42+ if __name__ == "__main__":
43+ from doctest import testmod
44+
45+ testmod()
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