ISBN13 check digit: Difference between revisions
Added Go
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=={{header|Go}}==
<lang go>package main
import (
"fmt"
"strings"
"unicode/utf8"
)
func checkIsbn13(isbn string) bool {
// remove any hyphens or spaces
isbn = strings.ReplaceAll(strings.ReplaceAll(isbn, "-", ""), " ", "")
// check length == 13
le := utf8.RuneCountInString(isbn)
if le != 13 {
return false
}
// check only contains digits and calculate weighted sum
sum := int32(0)
for i, c := range isbn {
if c < '0' || c > '9' {
return false
}
if i%2 == 0 {
sum += c - '0'
} else {
sum += 3 * (c - '0')
}
}
return sum%10 == 0
}
func main() {
isbns := []string{"978-1734314502", "978-1734314509", "978-1788399081", "978-1788399083"}
for _, isbn := range isbns {
res := "bad"
if checkIsbn13(isbn) {
res = "good"
}
fmt.Printf("%s: %s\n", isbn, res)
}
}</lang>
{{out}}
<pre>
978-1734314502: good
978-1734314509: bad
978-1788399081: good
978-1788399083: bad
</pre>
=={{header|langur}}==
Line 49 ⟶ 100:
978-1788399081: good
978-1788399083: bad</pre>
=={{header|Python}}==
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