Number Format

Numbers in Quex are specified in a way similar to what is common practice in many programming languages such as C, Python, Java, etc. – with some convenient extensions. Number formats are as follows:

no prefix as in "4711"

Normal decimal integers do not start with ‘0’ and have none of the prefixes below.

0x as in "0xC0.FF.EE" or "0x3fea"

Hexadecimal numbers need to be preceded by ‘0x’. The dots inside the hexadecimal numbers are meaningless for the parser, but may facilitate the reading for the human reader.

0o as in "0o751"

Octal numbers are preceded by ‘0o’.

0b as in "0b100.1001"

Binary numbers are preceded by ‘0b’. Again, redundant dots may facilitate the human interpretation of the specified number.

0r as in "0rXMVIII" or "0rvii"

Roman numbers must be preceded by a ‘0r’ prefix.

0n as in "0naabdea" or "0nABHJ"

Napier numbers (location arithmetic) must be preceded by a ‘0n’ prefix.