Java

public class CateringOrderApp {

	public static void main(String[] args) {
		
		Scanner keyboard = new Scanner(System.in);
		
		//Declares tax rate constant.
		double SALES_TAX_RATE = .0875;
		//Declares calculation variables.
		double subtotalCost;
		double taxAmount;
		double totalCost;
		//Sets constant prices for items.
		double VEGGIE_SANDWICH_PRICE = 2.75;
		double HAM_AND_CHEESE_SANDWICH_PRICE = 3.25;
		double SPAGHETTI_PRICE = 35.00;
		double SALAD_PRICE = 18.00;
		//Declares order count for items
		double veggieSandwichCount = 0;
		double hamAndCheeseSandwichCount = 0;
		double spaghettiCount = 0;
		double saladCount = 0;
		
		//Displays menu
		System.out.println("Food Item                                          Price");
		System.out.println("--------------------------------------------------------");
		System.out.println("Veggie Sandwich                                    $2.75");
		System.out.println("Ham and Cheese Sandwich                            $3.25");
		System.out.println("Spaghetti (tray serves 20)                        $35.00");
		System.out.println("Salad (tray serves 20                             $18.00");
		System.out.println("--------------------------------------------------------");
		
		//Begins to ask customer about the number of orders for each specific item.
		System.out.println("Please enter the amount of Veggie sandwiches that you want: ");
		veggieSandwichCount = keyboard.nextDouble();
		System.out.println("Please enter the amount of Ham and Cheese sandwiches that you want: ");
		hamAndCheeseSandwichCount = keyboard.nextDouble();
		System.out.println("Please enter the orders of Spaghetti that you want: ");
		spaghettiCount = keyboard.nextDouble();
		System.out.println("Please enter the orders of salad that you want: ");
		saladCount = keyboard.nextDouble();
		
		//Calculations for
		//totals, including tax amount.
		subtotalCost = (veggieSandwichCount*VEGGIE_SANDWICH_PRICE)+
				(hamAndCheeseSandwichCount*HAM_AND_CHEESE_SANDWICH_PRICE)+
				(spaghettiCount*SPAGHETTI_PRICE)+
				(saladCount*SALAD_PRICE);
		taxAmount = (subtotalCost*SALES_TAX_RATE);
		totalCost = (subtotalCost + taxAmount);
		
		//Displays all of this information after having been calculated.
		System.out.println("Food Item                                 Number Ordered");
		System.out.println("--------------------------------------------------------");
		System.out.println("Veggie Sandwich                            " + veggieSandwichCount);
		System.out.println("Ham and Cheese Sandwich                    " + hamAndCheeseSandwichCount);
		System.out.println("Spaghetti (tray serves 20)                 " + spaghettiCount);
		System.out.println("Salad (tray serves 20                      "  + saladCount);
		System.out.println("--------------------------------------------------------");
		//Prints total cost information
		System.out.println("Sutotal: " + subtotalCost);
		System.out.println("Tax Amount: " + taxAmount);
		System.out.println("Total: " + totalCost);
		
	}

}

 double x = 100.5;
 p.m1( x );
 System.out.println("" + x);
 double[] xa1 = {10,20,30,40};
 //p.m5( xa1 );
 for (int i=0;i<4;i++){
     System.out.println(xa1[i]);
 }

 public void m1(double a) {
   a += 100;
 }

 public void m5(double[] x) {

 for(int i=0; i < x.length; i++)
     x[i] += 100;

}