swap/fibonacci/factorial

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package javaapplication85;

import java.util.Scanner;

/**
 *
 * @author Student
 */
public class JavaApplication85 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner scan =new Scanner(System.in);

        System.out.println("Menu");
        System.out.println("[1] Swap and Set");
        System.out.println("[2] Fibonacci");
        System.out.println("[3] Factorial");
        System.out.print("Choose: ");
        int a=scan.nextInt();

        if (a==1) {
        System.out.println("Swap and Sort");
        System.out.println(" ");
        int x,y,temp;
        System.out.print("Num 1: ");
        x=scan.nextInt();
        System.out.print("Num 2: ");
        y=scan.nextInt();
        //swapping
        temp=x;
        x=y;
        y=temp;
        //output
        System.out.println("Swapped numbers:");
        System.out.println("Num 1: "+x);
        System.out.println("Num 2: "+y);
        }

        else if (a==2) {

        System.out.println("Fibonacci");
        System.out.print("Num 1: ");
        int n1=scan.nextInt();
        System.out.print("Num 2: ");
        int n2=scan.nextInt();
        int temp =0;

        for (int i=1;i<=10;i++){

        temp=n1+n2;
        n1=n2;
        n2=temp;

        System.out.println(n2);}
        }

        else if (a==3) {
         int n,c,fact=1;
         System.out.println("Factorial");
         System.out.print("Enter number: ");
         n=scan.nextInt();
         if (n<0)
         System.out.println("Number should be non-negative!");
          else
          {
          for (c=1;c<=n;c++)
          fact=fact*c;
          System.out.println("Factorial: "+fact);
          }
        }

        else {
        System.out.println("Please choose the right value.");}






    }

}