| unifies the number of the characters of an atom.
atom_length(+Atom, -Number)
atom_length/2 unifies Number with the number of characters
of Atom.
Arguments
Atom atom
Number integer >= 0
Examples
| atom_length('this is quite a long text', N). |
Succeeds with substitution N <- 25 |
| atom_length('four', 4). |
Succeeds. |
| atom_length('five', 5). |
Fails. |
Standard
This predicate is part of the ISO-Prolog Standard.
See also
atom_chars/2,
atom_codes/2,
atom_concat/3,
atom_length/2,
char_code/2,
number_chars/2,
number_codes/2,
parse_atom/2/3,
sub_atom/5.
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