Useful Programs of Core Java

There is given some useful programs such as factorial number, prime number, fibonacci series etc.

1) Program of factorial number.

class Operation{

 static int fact(int number){

  int f=1;

  for(int i=1;i<=number;i++){

  f=f*i;

  }

 return f;

 }

 public static void main(String args[]){

  int result=fact(5);

  System.out.println("Factorial of 5="+result);

 }

}

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2) Program of fibonacci series.

class Fabnoci{

  public static void main(String...args)

  {

    int n=10,i,f0=1,f1=1,f2=0;

      for(i=1;i<=n;i++)

      {

        f2=f0+f1;

        f0=f1;

        f1=f2;

          f2=f0;

          System.out.println(f2);

      }

     

   }

 }

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3) Program of armstrong number.

class ArmStrong{

  public static void main(String...args)

  {

    int n=153,c=0,a,d;

      d=n;

      while(n>0)

      {

      a=n%10;

      n=n/10;

      c=c+(a*a*a);

      }

      if(d==c)

      System.out.println("armstrong number");

      else

    System.out.println("it is not an armstrong number");

     

   }

}

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4) Program of checking palindrome number.

class Palindrome

{

   public static void main( String...args)

  {

   int a=242;

   int  n=a,b=a,rev=0;

   while(n>0)

   {

     a=n%10;

     rev=rev*10+a;

     n=n/10;

   }

   if(rev==b)

   System.out.println("it is Palindrome");

   else

   System.out.println("it is not palinedrome");

 

  }

}

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5) Program of swapping two numbers without using third variable.

class SwapTwoNumbers{

public static void main(String args[]){

int a=40,b=5;

a=a*b;

b=a/b;

a=a/b;

System.out.println("a= "+a);

System.out.println("b= "+b);

}

}

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6) Program of factorial number by recursion

class FactRecursion{

static int fact(int n){

if(n==1)

return 1;

return n*=fact(n-1);

}

public static void main(String args[]){

int f=fact(5);

System.out.println(f);

}

}