ISC Practical 2015 - Question 3.

/**
* The program inputs two integers 'm' and 'n' and prints the smallest integer greater than 'm' whose sum of digits is equal to 'n'.
*/
import java.util.Scanner;
public class Prac_2015
{
    public static int findsum(int num)
    {
        int i,x;
        String a=Integer.toString(num);
        int sum=0;
        for(i=0;i<a.length();i++)
        {
            x=Character.getNumericValue(a.charAt(i));
            sum+=x;
        }
        return sum;
    }
    public static int digPresent(int num)
    {
        String a=Integer.toString(num);
        int i; int ct=0;
        for(i=0;i<a.length();i++)
        {
            ct++;
        }
        return ct;
    }
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        int m,n;  //ATQ- m is between 100 and 10000 and n is less than 100.
        System.out.println("Please enter the greater number. It must be between 100 and 10000.");
        m=sc.nextInt();
        System.out.println("Please enter the smaller number. It must be a positive number lesser than 100.");
        n=sc.nextInt();
        if(m<100 || m>10000 || n<1 || n>99)
        {
            System.out.println("Invalid input. Please try again.");
        }
        else
        {
        int i; int sum=0,totaldig;
        i=m+1;
        while(i>m)
        {
            sum=findsum(i);
            if(sum==n)
            {
                break;
            }
            i++;
        }
                totaldig=digPresent(i);
                System.out.println("The required number = "+i);
                System.out.println("Total number of digits = "+totaldig);
        }
        sc.close();
    }
}