0b100100101

0b100100101 is a binary literal commonly used in programming and digital electronics. The prefix 0b (or 0B) indicates that the digits following it are base-2. The bit pattern comprises nine bits: 1,0,0,1,0,0,1,0,1.

As an unsigned integer, this pattern represents the decimal value 293 and the hexadecimal value 0x125.

When interpreted as a fixed-width signed value using nine-bit two's complement, the same bit pattern can correspond to -219. In most high-level languages, binary literals are interpreted as nonnegative integers unless a fixed-width signed type is used that yields a negative value through sign extension.

Common uses include specifying constants, bit masks, or flag sets in source code, or representing small binary data sequences in documentation or tests. The exact meaning depends on context, such as the surrounding type width and interpretation rules.

Languages that support the 0b prefix for binary literals include Python, Java, JavaScript, C++, Rust, and others. The prefix is widely used to express binary values directly in source code without converting from decimal.