Binary, Hex and Octal Literal Reader

Medium ⏱ 12 min 60% acceptance ★★★★★ 4.9

Write a function parse_number(text) that accepts a string representing a number in binary ("0b..."), octal ("0o..."), hexadecimal ("0x..."), or plain decimal, and returns its integer value. Use int() with base 0 so the prefix determines the base automatically.

Examples

Example 1

Input

parse_number("0b101")

Output

Explanation

Binary 101 = 5 in decimal.

Example 2

Input

parse_number("0x1A")

Output

Explanation

Hex 1A = 26 in decimal.

Example 3

Input

parse_number("42")

Output

Explanation

Plain decimal string.

Constraints

Input is always a valid literal Python could parse this way.

Topics

Variables & Data Typesnumber bases

Companies

CiscoIntel

Hints

Hint 1

`int(text, 0)` lets Python infer the base from the prefix.

Hint 2

Base 0 falls back to base-10 when there is no recognized prefix.

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