ISBN IN JAVA Program
Almost every book carry number called ‘The International Standard Book Number (ISBN)’ which is a unique number. By this number, we can find any book. It is a 10 digit number. The ISBN is legal if 1*digit1 + 2*digit2 + 3*digit3 + 4*digit4 + 5*digit5 + 6*digit6 + 7*digit7 + 8*digit8 + 9*digit9 + 10*digit10 is divisible by 11.
Example: For an ISBN "1259060977"
Sum = 1*10 + 2*9 + 5*8 + 9*7 + 0*6 + 6*5 + 0*4 + 9*3 + 7*2 + 7*1 = 209
Now divide it with 11 = 20%/11 = 0. If the resultant value will be Zero
then it is a valide ISBN.
Write a program to:
(i) input the ISBN code as a 10-digit number
(ii) If the ISBN is not a 10-digit number, output the message “Illegal ISBN” and terminate the program
(iii) If the number is 10-digit, extract the digits of the number and compute the sum as explained above.
(i) input the ISBN code as a 10-digit number
(ii) If the ISBN is not a 10-digit number, output the message “Illegal ISBN” and terminate the program
(iii) If the number is 10-digit, extract the digits of the number and compute the sum as explained above.
If the sum is divisible by 11, output the message “Legal ISBN”. If the sum is not divisible by 11, output the message “Illegal ISBN”.
Solution
import java.io.*;
/**
* Khurshid Md Anwar #inspireSkill
*/
class ISBNumber {
public static void
main(String[] args) throws IOException {
long isbnNumber;
int s = 0, i, t, d,
dNumber;
String st;
// Input a 10-digit ISBN
number
InputStreamReader in = new
InputStreamReader(System.in);
BufferedReader br = new
BufferedReader(in);
System.out.print("Input a 10-digit ISBN number: ");
isbnNumber =
Long.parseLong(br.readLine());
// check the length is 10,
otherwise, exit from the program
st = "" +
isbnNumber;
if (st.length() != 10) {
System.out.println("Illegal ISBN");
return;
}
// : For an ISBN
1259060977
//S = 1*10 + 2*9 + 5*8 +
9*7 + 0*6 + 6*5 + 0*4 + 9*3 + 7*2 + 7*1 = 209
// which is divisible by
11.
// compute the s of the
digits
s = 0;
for (i = 0; i <
st.length(); i++) {
d =
Integer.parseInt(st.substring(i, i + 1));
dNumber = i + 1;
t = dNumber * d;
s += t;
}
// check the number s is
divisible by 11 or not
if ((s % 11) != 0) {
System.out.println("Illegal ISBN");
} else {
System.out.println("Legal ISBN");
}
}
}
Output
Input a 10-digit ISBN number: 1259060977
Legal ISBN
Input a 10-digit ISBN number: 1245876589
Legal ISBN
Input a 10-digit ISBN number: 1234567890
Illegal ISBN
Click for more number program
