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102 lines
1.9 KiB
Markdown
102 lines
1.9 KiB
Markdown
---
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id: 68c497f3aaefc9fd9f1b0e26
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title: "Challenge 62: Hex to Decimal"
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challengeType: 29
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dashedName: challenge-62
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---
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# --description--
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Given a string representing a hexadecimal number (base 16), return its decimal (base 10) value as an integer.
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Hexadecimal is a number system that uses 16 digits:
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- `0-9` represent values `0` through `9`.
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- `A-F` represent values `10` through `15`.
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Here's a partial conversion table:
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| Hexadecimal | Decimal |
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|:-----------:|:-------:|
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| 0 | 0 |
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| 1 | 1 |
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| ... | ... |
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| 9 | 9 |
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| A | 10 |
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| ... | ... |
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| F | 15 |
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| 10 | 16 |
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| ... | ... |
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| 9F | 159 |
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| A0 | 160 |
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| ... | ... |
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| FF | 255 |
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| 100 | 256 |
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- The string will only contain characters `0–9` and `A–F`.
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# --hints--
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`hex_to_decimal("A")` should return `10`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(hex_to_decimal("A"), 10)`)
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}})
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```
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`hex_to_decimal("15")` should return `21`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(hex_to_decimal("15"), 21)`)
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}})
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```
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`hex_to_decimal("2E")` should return `46`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(hex_to_decimal("2E"), 46)`)
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}})
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```
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`hex_to_decimal("FF")` should return `255`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(hex_to_decimal("FF"), 255)`)
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}})
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```
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`hex_to_decimal("A3F")` should return `2623`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(hex_to_decimal("A3F"), 2623)`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def hex_to_decimal(hex):
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return hex
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```
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# --solutions--
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```py
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def hex_to_decimal(hex):
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return int(hex, 16)
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```
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