Write a program to input a number and find the sum of First and Last digit of this number?(2784=2+4=6first and last digit sum)

45)  Write a program to input a number and find the sum of First and Last digit of this number?(2784=2+4=6first and last digit sum)

import java.util.*;

public class First_last_digit_sum

{

   public static void main(String args[ ])

   {

      Scanner sc = new Scanner (System.in);

      System.out.println("Enter a number");

      int a = sc.nextInt();

      int p =a;

      int c = 0;

      while(p>0)

      {

          p=p/10;

          c++;

      }

      int x = (int)Math.pow(10,(c-1));

      int l = a/x;

      int f = a%10;

      int s = l+f;

      System.out.println("SUM of FIRST and LAST digit of a entered number = "+s);

    }

}

Output :  

sum-of-first-and-last-digit-of-a-number

Write a program to input a number and find the Sum and Count the all digit of this number.(2784=2+7+8+4=21…no. of digit=4)

Write a program to input a number and find the Sum and Count the all digit of this number.(2784=2+7+8+4=21…no. of digit=4)

44)   Write a program to input a number and find the Sum and Count the all digit of this number.  (2784=2+7+8+4=21…no. of digit=4)

import java.util.*;

public class sum_count_digits

{

   public static void main(String args[ ])

   {

      Scanner sc = new Scanner (System.in);

      System.out.println("Enter a number");

      int a = sc.nextInt();

      int c = 0;

      int s = 0;

      while(a>0)

      {

          int d = a%10;

          c++;

          s=s+d;

          a=a/10;

      }

      System.out.println("SUM of all digits of a entered number = "+s);

      System.out.println("Number of digits in a entered number = "+c);

    }

}

 

 Output : 

sum-of-all-digits-of-a-number

  Write a program to input a number and find it’s all Prime Factor and print it?(12==2,2,3….all factors are prime)

 

Write a program to input a number and find it’s all Prime Factor and print it?(12==2,2,3….all factors are prime)

43)  Write a program to input a number and find it’s all Prime Factor and print it?(12==2,2,3….all    factors are prime)

import java.util.*;

public class Prime_factor

{

    public static void main(String args[ ])

   {

      Scanner sc = new Scanner (System.in);

      System.out.println("Enter a number");

      int a = sc.nextInt();

      int t = a/2;

      System.out.print("PRIME FACTOR of "+a+" = ");

 if(a==1)

 {

   System.out.println(a);

 } 

     

      for(int i = 2;i<=t;)

      {

          if(a%i==0)

          {

             System.out.print(i+" ");

             a=a/i;

          }

          else

          {

             i++;

          }

      }

 

   }

   }

Output : 

prime-factor-of-a-number

 Write a program to input a number and find the Primorial of this number? (6= 2, 3, 5 à2*3*5=30)

 

Write a program to input a number and find the Primorial of this number? (6= 2, 3, 5 =2*3*5=30)

42)   Write a program to input a number and find the Primorial of this number? (6= 2, 3, 5        à2*3*5=30)

import java.util.*;

public class Primorial

{

   public static void main(String args[ ])

   {

      Scanner sc = new Scanner (System.in);

      System.out.println("Enter a number");

      int a = sc.nextInt();

      int p=1;

      for(int i=2;i<=a;i++)

      {

        int c = 0;

        for(int j=1;j<=i;j++)

        {

            if(i%j==0)

            c++;

        }

        if(c==2)

        {

            p = p*i;

        }                 

      }

      System.out.println("PRIMORIAL of "+a+" = "+p);

    }

}

output :  

primorial-of-a-number

41)   Write a program to input two integers and find the GCD/HCF of two numbers (using division method)? (10,12, HCF=2)

 

Write a program to input two integers and find the GCD/HCF of two numbers (using division method)? (10,12, HCF=2)

41)   Write a program to input two integers and find the GCD/HCF of two numbers (using division method)? (10,12,   HCF=2)

import java.util.*;

public class GCD

{

    public static void main(String args[ ])

   {

      Scanner sc = new Scanner (System.in);

      System.out.println("Enter two numbers");

      int a = sc.nextInt();

      int b = sc.nextInt();

      int k = Math.min(a,b);

      b = Math.max(a,b);

      a=k;

      while(k!=0)

      {

          k=b%k;

          if(k!= 0)

          {

              b=a;

              a=k;

          }

      }

      System.out.println("G.C.D = "+a);

   }

}

GCD-of-two-numbers

40)   Write a program to input two integers and find the HCF of two numbers? (10,12. HCF=2)

 

Write a program to input two integers and find the HCF of two numbers? (10,12. HCF=2)

40)  Write a program to input two integers and find the HCF of two numbers? (10,12. HCF=2)

import java.util.*;

public class HCF

{

   public static void main(String args[ ])

   {

      Scanner sc = new Scanner (System.in);

      System.out.println("Enter two numbers");

      int a = sc.nextInt();

      int b = sc.nextInt();

      for(int i = Math.min(a,b);i>=1;i--)

      {

              if(a%i==0&&b%i==0)

              {

                  System.out.println("H.C.F of "+a+" and "+b+" = "+i);

                  break;

              }

      }

   }

}

hcf-of-two-numbers

39)       Write a program to input two integers and find the LCM of two numbers?(10,12..LCM=60 )

 

Write a program to input two integers and find the LCM of two numbers?(10,12..LCM=60 )

39)  Write a program to input two integers and find the LCM of two numbers?(10,12..LCM=60 )

import java.util.*;
public class LCM
{
   public static void main(String args[ ])
   {
      Scanner sc = new Scanner (System.in);
      System.out.println("Enter two numbers");
      int a = sc.nextInt();
      int b = sc.nextInt();
      for(int i = Math.max(a,b);i<a*b;i++)
      {
              if(i%a==0&&i%b==0)
              {
                  System.out.println("L.C.M of "+a+" and "+b+" = "+i);
                  break;
              }
      }
   }

}

output : 

lcm-of-two-numbers

Write a program to input two integers and find the HCF of two numbers? (10,12. HCF=2)