0o2002

0o2002 is an octal numeral written with the 0o prefix, a convention used by several programming languages to denote numbers in base eight. Languages such as Python (version 3 and later), JavaScript (ES6), and Rust adopt this explicit prefix to distinguish octal literals from decimal and hexadecimal literals.

In decimal terms, 0o2002 equals 1026. This is calculated as 2 × 8^3 + 0 × 8^2 + 0 × 8^1 + 2 × 8^0 = 1024 + 2 = 1026. Its hexadecimal representation is 0x402, since 0x400 equals 1024 and adding 0x2 yields 1026. The corresponding binary form is 10000000010. The digits 2-0-0-2 reflect the octal digits that form the value.

Usage and notes: 0o2002 can appear in source code as a numeric constant, for example when specifying bit masks, configuration values, or other integer literals. It is distinct from Unix-style file permission notations, which are often written in octal but indicate permission bits rather than a general numeric value. In Python 3, 0o2002 is parsed directly as the integer 1026; in other languages the exact interpretation depends on the language’s literal rules. Historically, octal literals were sometimes written with a leading 0 (without the o), as in C and C++, but this older style can be error-prone and is less common in modern code. See also octal notation, and language-specific literal syntax.