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ISBN13 check digit: Difference between revisions
Added code for java
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350 END DEF</lang>
=={{header|Java}}==
<lang java>public static void main(){
System.out.println(isISBN13("978-1734314502"));
System.out.println(isISBN13("978-1734314509"));
System.out.println(isISBN13("978-1788399081"));
System.out.println(isISBN13("978-1788399083"));
}
public static boolean isISBN13(String in){
int pre = Integer.parseInt(in.substring(0,3));
if (pre!=978)return false;
String postStr = in.substring(4);
if (postStr.length()!=10)return false;
int post = Integer.parseInt(postStr);
int sum = 38;
for(int x = 0; x<10;x+=2)
sum += (postStr.charAt(x)-48)*3 + ((postStr.charAt(x+1)-48));
if(sum%10==0) return true;
return false;
}
</lang>{{out}}
<pre>
true
false
true
false
</pre>
=={{header|Julia}}==
<lang julia>function isbncheck(str)
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