ISBN Number.

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Program to check whether a given number is ISBN number or not.


  • An ISBN(International Standard Book Number) is a ten digit code which uniquely identifies a book.
  • The first nine digits represent the Group, Publisher and Title of the book.
  • Each of the first nine digits of the code can take a value between 0 and 9. Sometimes it is necessary to make the last digit equal to ten, this is done by writing the last digit of the code as 'X'
  • To verify an ISBN number, calculate 10 times the fist digit, plus 9 times the second digit, plus 8 times the third and so on until 1 time the last digit. If the final number leaves no remainder when divided by 11, the code is a valid number.

eg. 007462542X = (10*0)+(9*0)+(8*7)+(7*4)+(6*6)+(5*2)+(4*5)+(3*4)+(2*2)+(1*10)=176
Similarly 0764526413 and 0112362221






                         SOURCE CODE


import java.io.*;
public class ISBN
{
    public static void main(String args[])throws IOException
    {
        BufferedReader br=new BufferedReader (new InputStreamReader(System.in));
        System.out.println("Enter a 10 digit No.");
        String str=br.readLine();
        int l=str.length();
        int n=0,isbn=0;
        if(l==10)
        {
            for(int i=9,j=10;i>=0;i--,j--)
            {
                char ch=str.charAt(i);
                if(ch>=48&&ch<=57)
                {
                    n=ch-48;                    
                }
                else if(ch=='X')
                {
                    n=10;
                }
                isbn=isbn+n*j;
            }
            if(isbn%11==0)
                System.out.println("Yes,It is a ISBN No.");
            else
                System.out.println("No,It is not a ISBN No.");
        }
        else
        {
            System.out.println("Invalid");
        }
    }
}


If you want to download this program then Click Here

OUTPUT


                             


 

                         





If you have any question then leave a comment below I will do my best to answer that question.


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