ISBN13 check digit: Difference between revisions
→{{header|Rust}}
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ISBN-13 code 9781788399083 isn't valid.
</pre>
=={{header|Ruby}}==
{{trans|C#}}
<lang ruby>def checkISBN13(code)
length = 0
sum = 0
code.split('').each { |c|
if '0' <= c and c <= '9' then
if length % 2 == 0 then
sum = sum + 1 * (c.ord - '0'.ord)
else
sum = sum + 3 * (c.ord - '0'.ord)
end
length = length + 1
end
}
if length != 13 then
return false
end
return sum % 10 == 0
end
def main
puts checkISBN13("978-1734314502")
puts checkISBN13("978-1734314509")
puts checkISBN13("978-1788399081")
puts checkISBN13("978-1788399083")
end
main()</lang>
{{out}}
<pre>true
false
true
false</pre>
=={{header|Rust}}==
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