Control Statements Programs In Java

To check a number is Odd or Even?

import java.util.Scanner;

public class Check{

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

 System.out.println("Enter an number\n");

   int n=sc.nextInt();

 if (n%2 == 0)

{

   System.out.println("Even\n");

}

   else

{

     System.out.println("Odd\n");

}

}

}

To check  whether a year is leap year or Not?

import java.util.Scanner;

public class A {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

 System.out.println("Enter year\n");

  int year=sc.nextInt();

 if (year%4 == 0)

{

   System.out.println("Leap Year\n");

 }

   else{

     System.out.println("Non Leap Year\n");

 }

}

}

Calculate sum of digits of a number?

import java.util.Scanner;

public class Digit {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int  t, sum = 0, remainder;

System.out.println("Enter a Number\n");

  int num=sc.nextInt();

   t = num;

  while (t != 0)

   {

      remainder = t % 10;

      sum = sum + remainder;

      t= t / 10;

   }

  System.out.println("Sum of digits \n"+(sum));

}

}

Calculate Factorial Number?

import java.util.Scanner;

public class Facto {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

  long fact = 1;

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

  int n=sc.nextInt();

 while(n>0)

  {

      fact=fact*n;

      n--;

  }

System.out.println("Factorial is \n"+(fact));

}

}

Swapping of two numbers?

import java.util.Scanner;

public class B {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

int temp;

System.out.println("Enter the value of x and y\n");

 int x=sc.nextInt();

 int y=sc.nextInt();

  System.out.println("Before Swapping x \n and y \n"+ x +"\t "+y);

   temp = x;

   x = y;

   y = temp;

System.out.println("After Swapping  x \n and y \n "+x+"\t" +y);

}

}

To find whether a number is Armstrong number or not?

import java.util.Scanner;

public class Arms {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

int n, sum = 0, t, remainder;

System.out.println("Enter number \n");

n=sc.nextInt();

 t = n;

  while( t != 0 )  {

      remainder = t%10;

      sum = sum + remainder*remainder*remainder;

      t = t/10;

   }

   if ( n == sum )

      System.out.println("The number is an Armstrong number ");

   else

      System.out.println("The number  is not an Armstrong number");

}

}

Find the Largest Number Among Three Numbers

import java.util.Scanner;

public class Large {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter a \n");

int a=sc.nextInt();

System.out.println("Enter b \n");

int b=sc.nextInt();

System.out.println("Enter c \n");

int c=sc.nextInt();

  if(a>=b && a>=c)

        System.out.println("\nThe largest number is\n"+a);

      else if(b>=a && b>=c)

         System.out.println("\nThe largest number is \n"+b);

      else

         System.out.println("\nThe largest number is \n"+c);

}

}

SWAPPING OF 2 NUMBERS WITHOUT THIRD VARIABLE

import java.util.Scanner;

public class Swap {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter the value of x and y\n");

int x=sc.nextInt();

int y=sc.nextInt();

   System.out.println("Before Swapping x\n and y\n"+ x +"\t" +y);

   x=x-y;

   y=x+y;

   x=y-x;

System.out.println("After Swapping  x \n and y\n "+x+"\t" +y);

}

}

Find square and cube of a given number

import java.util.Scanner;

public class A {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

System.out.println("Enter no \n");

int n=sc.nextInt();

 System.out.println("Square of the number"+(n*n));

 System.out.println("Cube of the number"+(n*n*n));

}

}

To Check Whether a Number is Prime or Not

import java.util.Scanner;

public class Prm {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int i,pm = 0;

System.out.println("Please enter a number: \n");

int num=sc.nextInt();

   for(i=1; i<=num; i++)

   {

      if(num%i==0)

      {

         pm++;

      }

   }

   if(pm==2)

   {

      System.out.println("it is a prime number.");

   }

   else

   {

      System.out.println("it is not a prime number.");

   }

}

}

Write a program to find reverse of a number

import java.util.Scanner;

public class R {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

int reverse = 0;

System.out.println("Please enter a number: \n");

int n=sc.nextInt();

   while (n != 0)

   {

      reverse = reverse * 10;

      reverse = reverse + n%10;

      n  = n/10;

   }

System.out.println("Reverse of entered number is =\n"+reverse);

}

}

To check whether a number is palindrome or Not

import java.util.Scanner;

public class Palnd {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int temp,reverse = 0;

System.out.println("Please enter a number: \n");

int n=sc.nextInt();

temp=n;

   while (temp != 0)

   {

      reverse = reverse * 10;

      reverse = reverse + temp%10;

      temp  = temp/10;

   }

if ( n == reverse )

      System.out.println("it is a palindrome number.\n");

   else

      System.out.println("it is not a palindrome number.\n");

}

}