Many security systems use a check digit. Bumble Bank uses the following check di

Question

Many security systems use a check digit. Bumble Bank uses the following check digit system for its bank account numbers. Add the 3 digits. If the sum is even, the check digit should be 0. If the sum is odd, the check digit should be 1. Write a program in Java to check for valid bank account numbers. Ask for the bank account number. If the number given is 4 digits and the ones digit is a correct check digit, tell the user that is a valid account number. If the number is not a 4 digit number or if the ones digit is not the correct check digit report a fake.

Explanation / Answer

package mani;

import java.util.Scanner;

public class Problem2 {
public static void main(String[] args) {
String accno;
Scanner scan=new Scanner(System.in);
System.out.print("What is your bank account number? ");
accno=scan.next();
if(Integer.parseInt(accno)>=1000&&Integer.parseInt(accno)<=9999){
   int sum=0;
   for(int i=0;i<3;i++){
       sum=sum+Character.getNumericValue(accno.charAt(i));
   }
   if(sum%2==1){
       if(accno.charAt(3)=='1'){
           System.out.println(accno+" is a valid account number.");
       }
       else{
       System.out.println(accno+" is a fake account number!");
   }
   }
       else if(sum%2==0){
       if(accno.charAt(3)=='0'){
           System.out.println(accno+" is a valid account number.");
       }
       else{
       System.out.println(accno+" is a fake account number!");
   }
   }else{
       System.out.println(accno+" is a fake account number!");
   }
}
else{
   System.out.println(accno+" is a fake account number!");
}
}
}

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