number literal


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number literal

Last updated at 9:52 pm UTC on 2 January 2018

Notation - BNF

number = ["-"][radix"r"]["-"]digits["."digits]["e"["-"]exponent]
exponent = decimal_digits
radix = decimal_digits
digits = [digit]+
digit = decimal_digit | uppercase letter
decimal_digits = [decimal_digit]+
decimal_digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"

NOTE:

the set of digits allowed in a number of radix N is the first N characters of the string:

'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
e.g., 2r10101 16r12ABCDEF

default radix = 10,
for all others you must explicitly specify the radix;

NOTE:

radix is between 2 and 36 inclusive, see anInteger radix: n
actually, Squeak checks only the lower bound
you may make the upper bound as large as you wish, but can represent only the first 36 digits of the larger base;
numbers entered using them are interpreted correctly however.

Examples:

123.2
16rABC
16r17
2r101
-112.3
2.5e6