Question

JAVA:

Write a program that inputs a string that represents a binary number. The string can contain only 0s and 1s and no other characters, not even spaces. Validate that the entered number meets these requirements. If it does not, display an error message. If it is a valid binary number, determine the number of 1s that it contains. If it has exactly two 1s, display "Accepted". Otherwise, display "Rejected". All input and output should be from the console.

Answer 1

package org.student;

import java.util.Scanner;

public class ValidateBinaryNumber {

   public static void main(String[] args) {
       //Declaring variables
       String binary;
       int countone,count;
      
       //Scanner class object is used to read the inputs entered by the user
       Scanner sc=new Scanner(System.in);
  
       //This while loop continue to execute until the user enters other than 'y' or 'Y'
   while(true)
   {
       //Assigning zero to variables
       count=0;
       countone=0;
         
       //Getting the String entered by the user
           System.out.print("Enter Binary Number :");
           binary=sc.nextLine();
          
           /* Checking whether the entered string is valid binary number or not
           * if yes,count no of ones
           * if not,Display error message
           */
           for(int i=0;i<binary.length();i++)
           {
              
               if(binary.charAt(i)=='0' || binary.charAt(i)=='1')
               {
                   if(binary.charAt(i)=='1')
                   countone++;
               }
               else
               {
                   //Displaying error message
                   System.out.println("** Invalid.Binary Number Must contain only 0's and 1's **");
                   count++;
               }  
              
              
           }
          
           if(count==0)
           {
               //If the number of ones is 2 then execute if block
               if(countone==2)
               {
                   System.out.println("Accepted");
               }
               else
               {
                   System.out.println("Rejected");
              
               }  
           }      
          
           //Getting the character from the user 'Y' or 'y' or 'N' or 'n'
           System.out.print("Do you want to enter again(Y/N) ::");
           char ch = sc.next(".").charAt(0);
           if(ch=='Y'||ch=='y')
           {
               sc.nextLine();
           continue;
           }
           else
           {
           System.out.println(":: Program Exit ::");
           break;
           }
   }
       }

   }

___________________

Output:

Enter Binary Number :1A00
** Invalid.Binary Number Must contain only 0's and 1's **
Do you want to enter again(Y/N) ::y
Enter Binary Number :101000
Accepted
Do you want to enter again(Y/N) ::n
:: Program Exit ::

_________Thank You