0x7

0x7 is a hexadecimal numeral. The prefix 0x indicates that the digits that follow are expressed in base-16. The value 0x7 equals decimal 7 and binary 111.

In many programming languages, 0x7 is a numeric literal parsed as an integer. For example, in C or Java, int a = 0x7; in Python or JavaScript, a = 0x7 yields the integer 7. The literal itself does not fix a width; the resulting value is interpreted according to the type of the variable or the language’s numeric rules.

Practical use often involves bitwise operations. Because 0x7 has the binary form ...00000111, it is commonly used as a bitmask to access or modify the lowest three bits of a value. For instance, x & 0x7 retains only those three bits, while x | 0x7 can set them. The same value may appear in routines that handle hexadecimal data, formatting, or parsing.

Origin and context: The 0x prefix originated in the C programming language and has since become a widespread convention for representing hexadecimal literals in many languages and tools. While 0x7 can appear in contexts such as hexadecimal addresses or data formats, as a value it represents the decimal seven.

See also: hexadecimal notation, bitmask, binary, programming languages.