Number

Syntax

Using the BNF language, a number can be defined as follows:

$ Number = Integer | Double

$ Integer = [sign] digit {digit}

$ Double = [sign] digit {digit} "." {digit} [Scale]

$ digit = “0” | “1” | “2” | “3” | “4” | “5” | “6” | “7” | “8” | “9”

$ sign = “+” | “-”

$ Scale = (“E” | “e”) [sign] digit {digit}

$ integer = [sign] digit {digit}

Description

A number (number) is a signed integer or real number.

See also:

Fore Dictionary