freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/68c497f3aaefc9fd9f1b0e26.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
68c497f3aaefc9fd9f1b0e26	Challenge 62: Hex to Decimal	29	challenge-62

--description--

Given a string representing a hexadecimal number (base 16), return its decimal (base 10) value as an integer.

Hexadecimal is a number system that uses 16 digits:

• 0-9 represent values 0 through 9.
• A-F represent values 10 through 15.

Here's a partial conversion table:

Hexadecimal	Decimal
0	0
1	1
...	...
9	9
A	10
...	...
F	15
10	16
...	...
9F	159
A0	160
...	...
FF	255
100	256

• The string will only contain characters 0–9 and A–F.

--hints--

hex_to_decimal("A") should return 10.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(hex_to_decimal("A"), 10)`)
}})

hex_to_decimal("15") should return 21.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(hex_to_decimal("15"), 21)`)
}})

hex_to_decimal("2E") should return 46.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(hex_to_decimal("2E"), 46)`)
}})

hex_to_decimal("FF") should return 255.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(hex_to_decimal("FF"), 255)`)
}})

hex_to_decimal("A3F") should return 2623.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(hex_to_decimal("A3F"), 2623)`)
}})

--seed--

--seed-contents--

def hex_to_decimal(hex):

    return hex

--solutions--

def hex_to_decimal(hex):

    return int(hex, 16)