ISBN13 check digit: Difference between revisions
Add SETL
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978-1788399083: FALSE
</pre>
=={{header|SETL}}==
<syntaxhighlight lang="setl">program isbn13;
loop for test in [
"978-0596528126", "978-0596528120",
"978-1788399081", "978-1788399083"
] do
print(test + if valid_isbn13 test then ": good" else ": bad" end);
end loop;
op valid_isbn13(isbn);
if #isbn /= 14
or isbn(4) /= '-'
or exists c in isbn | not c in "0123456789-" then
return false;
end if;
m := 3;
loop for ch in isbn | ch in "0123456789" do
s +:= val ch * (m := 4 - m);
end loop;
return s mod 10 = 0;
end op;
end program;</syntaxhighlight>
{{out}}
<pre>978-0596528126: good
978-0596528120: bad
978-1788399081: good
978-1788399083: bad</pre>
=={{header|Standard ML}}==
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