programs for you.

/* Finding factorial of a number input by user using while loop */


import java.util.Scanner;
class Factorial
{
   public static void main(String args[])
   {
      Scanner sc=new Scanner(System.in);
      System.out.print("Enter the number to find factorial: ");
      int num=sc.nextInt();
      int fact=1;
      while(num>0)
      {
         fact=fact*num;
         num=num-1;
      }
      System.out.println("Factorial is: " + fact);
   }
}

while(num>0)
{
   fact=fact*num;
   num=num-1;
}

can be replaced by

for(i=1;i<=num;i++)
{
   fact=fact*num;
}





Filename:      Factorial.java
Compile:       javac Factorial.java
Run:              java Factorial

/* Printing Hello World!! on the console. First Program in java. */


 class HelloWorld
{
   public static void main(String args[])
   {
      System.out.println("Hello World!!");
   }
}

Filename:      HelloWorld.java
Compile:       javac HelloWorld.java
Run:              java HelloWorld