0B00001011

0b00001011 is a binary literal used in programming to denote a specific base-2 value. The sequence 00001011, read as a binary number, equals decimal 11. In hexadecimal, the same value is 0x0B. The 0b prefix signals that the digits following it are in base 2 rather than decimal, hexadecimal, or octal.

Bit-pattern details: In an 8-bit representation, 00001011 has bits 0, 1, and 3 set (counting from the least significant bit at position 0). This makes the value 1 + 2 + 8 = 11. As a result, the value is 11 regardless of whether it is interpreted as unsigned or signed two's complement, since the most significant bit is 0 in this pattern.

Usage: Binary literals like this are common in low-level programming and digital electronics to specify bit masks, flags, or test patterns. For example, a mask of 0b00001011 can enable or check the bits 0, 1, and 3. Bitwise operations such as AND, OR, and XOR are often performed with such literals.

See also: binary numeral system, bitmask, two's complement, hexadecimal notation, and languages that support binary literals (Python, JavaScript, Java, C++, Rust).