9. Number Logic Programs

//Write a program in Java to accept a number from user and print the digits in Vertically reverse. 

import java.util.*;

class GreatestDigit

{

    public static void main()

    {

        Scanner sc=new Scanner(System.in);

        int n,r,t;

        System.out.print("Enter any number ");

        n=sc.nextInt();

        t=n;

        while(t!=0)

        {

            r=t%10;

            System.out.println(r);

            t/=10;

        }

    }

}

//Write a program in Java to accept a number from user and print the sum of the digits.  

import java.util.*;

class GreatestDigit

{

    public static void main()

    {

        Scanner sc=new Scanner(System.in);

        int n,r,t;

        System.out.print("Enter any number ");

        n=sc.nextInt();

        t=n;

        while(t!=0)

        {

            r=t%10;

    s = s + r;

            System.out.println(r);

            t/=10;

        }

            System.out.println("The Sum of Digits is "+s);

    }

}

/*Write a program in Java to accept a number from user and print the greatest digit. 

     For example 37825

     The greatest digit is 8

*/

import java.util.*;

class GreatestDigit

{

    public static void main()

    {

        Scanner sc=new Scanner(System.in);

        int n,r,t,g=0;

        System.out.print("Enter any number ");

        n=sc.nextInt();

        t=n;

        while(t!=0)

        {

            r=t%10;

            if(r>g) 

                g=r;

            t/=10;

        }

System.out.println("The Greatest Digits is " + g);

    }

}

/*Write a program in Java to accept a number from user and print the number as a Reverse Whole number. 

[Input: 123 (One Hundred Twenty Three)

Output: 321 (Three Hundred Twenty One)]

Note: You don't need to print the number in Words.

*/

import java.util.*;

class ReverseWholeNumber

{

    public static void main()

    {

        int n,r=0,t,rev=0;

        Scanner sc=new Scanner(System.in);

        System.out.print("Enter Any Number: ");

        n=sc.nextInt();

        t=n;

        while(t!=0)

        {

            r=t%10;

            rev = rev*10 + r;            

            t=t/10;

        }    

  System.out.println("The Original Number is " + s);

         System.out.println("The Reversed Number is " + rev);

    }

}

/*A special two-digit number is such that when the sum of the digits is added to the product of its digits, the result is equal to the original two-digit number.

Example:

Consider the number 59.

Sum of digits = 5+9=14

Product of its digits = 5 x 9 = 45

Sum of the digits and product of digits = 14 + 45 = 59

*/

import java.util.*;

class SpecialTwoDigitNumber

{

    public static void main()

    {

        int n,r=0,t,s=0,p=1;

        Scanner sc=new Scanner(System.in);

        System.out.print("Enter Any Number: ");

        n=sc.nextInt();

        t=n;

        while(t!=0)

        {

            r=t%10;

            s = s + r;

     p = p * r;            

            t=t/10;

        }    

        if((s+p)==n)

             System.out.println("It is a special two-digit number ");

else

              System.out.println("It is not a special two-digit number ");

    }

}