From 3d09c778b275b8d637524571765eab9719a18b36 Mon Sep 17 00:00:00 2001
From: aarush2410 <76821730+aarush2410@users.noreply.github.com>
Date: Mon, 4 Oct 2021 18:15:32 +0530
Subject: [PATCH] isbn

---
 isbn number.java | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 isbn number.java

diff --git a/isbn number.java b/isbn number.java
new file mode 100644
index 0000000..eb7c433
--- /dev/null
+++ b/isbn number.java	
@@ -0,0 +1,73 @@
+import java.util.*;   
+import java.io.*;   
+import java.util.Scanner;  
+  
+//create ISBNNumberExample class to check whether the given number is a valid ISBN or not  
+class ISBNNumberExample {   
+    
+     static boolean checkISBNNumber(long number)  
+    {  
+            int sum = 0;  
+    int i, t, intNumber, dNumber;  
+    String strNumber;  
+          
+    strNumber = ""+number;  
+          
+    if (strNumber.length() != 10) {  
+                    return false;  
+            }  
+          
+            for (i = 0; i < strNumber.length(); i++) {  
+                    intNumber = Integer.parseInt(strNumber.substring(i, i+1));  
+                    dNumber = i + 1;  
+                    t = dNumber * intNumber;  
+                    sum = sum + t;  
+            }  
+  
+            // check whether the sum is divisible by 11 or not  
+        
+            if ((sum % 11) == 0) {  
+                    return true;  
+            }  
+          
+    return false;  
+          
+    }  
+    
+    // main() method start  
+    public static void main(String args[])   
+    {     
+long n1, n2;  
+          
+    try {  
+              
+        //create BufferedReader class object to get input from user  
+        InputStreamReader in = new InputStreamReader(System.in);  
+        BufferedReader br = new BufferedReader(in);  
+          
+        //show custom message  
+        System.out.println("Enter first 10 digit ISBN number");  
+              
+        //store user entered value into variable n1  
+        n1 = Long.parseLong(br.readLine());  
+              
+        //show custom message  
+        System.out.println("Enter second 10 digit ISBN number");  
+              
+        //store user entered value into variable n2  
+        n2 = Long.parseLong(br.readLine());  
+              
+        if (checkISBNNumber(n1))   
+            System.out.println(n1 + " is a valid ISBN number");   
+        else  
+            System.out.println(n1 + " is not a valid ISBN number");   
+        if (checkISBNNumber(n2))   
+            System.out.println(n2 + " is a a valid ISBN number");   
+        else  
+            System.out.println(n2 + " is not a valid ISBN number");  
+              
+        }catch(java.lang.Exception e) {  
+            System.out.println("Error while reading the data.");  
+        }   
+        }   
+}