0111111111

0111111111 is a ten-character sequence consisting of a leading zero followed by nine ones. In plain text, it is often encountered as a binary-looking pattern or as a simple test input in computing, digital communications, and programming demonstrations.

If interpreted as a binary number, it is a 10-bit value with the most significant bit zero and the remaining nine bits set to one. The decimal value is 511 (2^9 − 1).

In languages that use a leading zero to indicate octal notation, such as some C-family languages, the literal 0111111111 would be parsed as an octal integer. Its decimal value would be the sum of 8^k for k from 0 to 8, which equals 19,173,961. If the sequence is treated strictly as a string or as a numeric literal in a context that does not parse octal notation, it remains simply the characters 0 and 1.

In data representation and testing, patterns like 0111111111 are used as simple bit patterns to examine parsing, bitwise operations, or serialization behavior. They also appear in tutorials illustrating binary notation or the distinction between strings of digits and numeric values. See also binary literals, octal notation, and bit patterns.