Question

Write a Program in Java to input a number and check whether it is a Unique Number or not.

( A Unique number is a positive integer (without leading zeros) with no duplicate digits. For example 7, 135, 214 , 5243 are all unique numbers whereas 33, 3121, 200 are not.)

Enter a number :
12345
It is an Unique Number

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Code

import java.util.*;

public class UniqueNumber

{

    public static void main(String args[] )

    {

        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a number :");
        int n=sc.nextInt();
        int flag=0,i,temp=0,count=0,r=0;

        for(i=0;i<=9;i++)
        {
            temp=n;
            count=0;
            while(temp>0)
            {
                r=temp%10;
                if(r==i) /* if any digits are repeated, then it is not a UniqueNumber*/

                {
                    count=count+1;
                }
                temp=temp/10;
            }
            if(count>1)
            {
                System.out.println(" It is not an UniqueNumber");
                flag=1;
                break;
            }

        }

        if(flag ==0)
        {
            System.out.println("It is an Unique Number");
        }
    }
}