a.  In order to have access to the Scanner class, you will need to add the following before the line declaring public class PizzaParty{}:

i. import java.util.Scanner;

b.  Once you imported the package, now you need to create a Scanner object (variable):

i. Scanner scan = new Scanner (System.in);

c.   Prompt the user for input & use scan to read in the following values:

i.     Hint: prompt using System.out.println ()

ii. budget = scan.nextDouble ();

iii. numFriends = scan.nextInt();

iv. avgSlicePerson = scan.nextDouble ();

v. costPerPizza = scan.nextDouble ();

6.  Evaluate the following expressions:

a.  wholePizzas : Calculate the number of pizzas needed:

i.     Use the numFriends and avgSlicePerson variables to calculate the number of slices required

double slices = (numFriends + 1) * avgSlicePerson;

ii.     Convert the total slices required into wholePizzas using the constant slicePerPizza

double pizzas = slices/slicePerPizza;

iii.     Use the Math.ceil () method to round the required number of pizzas (a double) up to the nearest whole number:

wholePizzas = (int) (Math.ceil(pizzas));

b. totalPizzaCost: Calculate the amount owed using costPerPizza and wholePizzas

c.   totalTaxOwed: Calculate the total tax on the order using totalPizzaCost and salesTax

d. total: Calculate the final total for the order including totalPizzaCost, totalTaxOwed, and deliveryFee.

7.  Display the calculated values to match the sample output below.

Friday Night Party

4 Pizzas: $42.00

Tax: $2.52

Delivery: $4.99

Total: $49.51

a. Rounding dollar values: All dollar amounts should be rounded to two decimal places. To do this, there are a few options:

i. System.out.printf("Total: $%.2f", total);

1.   this uses the formatted print function; note the commas between args not plus sign

ii. System.out.println ("Total: $"+( (int) (total*100))/100.0);

1.  This cuts off everything after two decimal places by        multiplying by 100, truncating then dividing by 100.0 (to return the number to its new double value)

8.  Repeat Steps #4-#7 once more to calculate the same costs for Saturday night.

a.  You may assume that all constants will remain the same, and that the user will enter different values for numFriends, avgSlicesPerson, and         costPerPizza.

9.  Be sure to display the grand total (including both Friday & Saturday costs) for the user.

10. Finally, display a message to the user indicating whether or not their plans fall within their budget.

a.  Note: there are NO IF statements required here. It is OK (and preferred)     that you simply print the boolean value as shown in the sample run below.

Sample output is included here:

Welcome to my Pizza Party Planner!

How much do you have to spend? 61.25

Enter the number of friends on friday: 4

Enter the average slices eaten per person: 8

Enter the cost per pizza: 10.50

Enter the number of friends on Saturday: 3

Enter the average slices eaten per person: 2

Enter the cost per pizza: 9.99

5 Pizzas: $52.50

Tax: $3.15

Delivery: $4.99

Total: $60.64

Saturday Night Party

1 Pizza: $9.99

Tax: $0.60

Delivery: $4.99

Total: $15.58

Weekend Total: 6 Pizzas for $76.22

Can you afford? False

Part 2: Formatting Phone Numbers

Description: The purpose of this program is to practice using the modulus operator to   isolate separate digits in an int value in order to reformat the phone number as a String.

Format Rule: Every US phone number consists of (at least) the following three parts: (Area Code) PreFix-LineNumber

TODO:

1.  Begin by creating a program called PhoneNumber.java. Be sure to include a header comment at the top of the file that includes your name, the date, the assignment and a brief description of the program.

2.  Declare public class PhoneNumber { }

3.  Within the class, declare public static void main (String []args){}

a.  This is where all of the following will go:

4. Declare long phoneNumber;

a.  Just as the double is more precise (holds more decimal places) than a float, a long is able to hold more digits than an integer.

b.  The max value that can be stored using integers is: 2147483647

c.  Try running your program using an int … what happens if the phone number goes over the max value?

5. Prompt the user to enter a 10 digit phone number.

6.  Use a Scanner variable to read in the user’s input.

a.  Don’t forget to:

i.     import java.util.Scanner; at the top of the file

ii.     Declare & create the scanner variable: Scanner in = new Scanner (System.in);

b.  Use the built-in method .nextLong () to read in a long value from STDIN using your scanner

7.  Using a combination of % (modulo) and / (division) operations, isolate the three groups of numbers in the following way:

a.  Using % 10 allows us to isolate the rightmost digits in a number.

i.     So, to isolate the 2 rightmost digits in 572, we would use 572 % 100;

ii.     This would yield 72

b.  Using / 10 (as integer) division allows us to perform an operation and truncate the results. This will allow us to shift the decimal place by a  desired number of spots.

i. 572/100 will return 5 (representing the third/last digit)

c.   LineNumber: the last 4 digits of the number

i. phoneNumber % 10000 would return the rightmost 4 digits

ii. phoneNumber /= 10000; would cut off the rightmost 4 digits (essentially removing LineNumber from the phoneNumber    variable)

d.  Prefix: the next 3 digits of the number. After removing the LineNumber,

i. phoneNumber % 1000 would return the rightmost 3 digits

ii. phoneNumber /= 1000; would cut off the rightmost 3 digits (essentially removing the prefix from the phone number)

e.  AreaCode: After removing the previous 7 digits (PreFix - LineNumber), the remaining digits represent the area code.

8.  Using concatenation (Strings), display the phone number entered in the format indicated above by the rule and below in the sample output.

a. Hint: you can print out multiple arguments in a System.out.println()        statement, separated by + indicating concatenation (not integer addition)

Sample run:

Enter a 10 digit phone number: 8005551212

Formatted phone number: (800) 555-1212

Notes:

●   You should include documentation throughout your code (but not on every line)

●   Be sure to compile and test often

●   Input validation is not required for either program