what's the $ sign mean?
For example:
is_digit(Ch) ->
$0 =< Ch andalso Ch =< $9.
I've also seen it been typed like:
$(, $), $+, $*
1 Answers
$ use to indicate character in ASCII. For example
1> $a.
97
2> $1.
49
3> [49,50].
"12"
4> $\n. ### newline character
10
Your function is meaning that the character input is digit or not.
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