Assignment 14
Due Tuesday, November 13 at 9:20am on Canvas

Assignment 14.1: Multiplication Tables (10 pts)

  • One of the principle applications of nested loops is to display tabular data (data organized into rows and columns).
  • For this assignment, let's practice the nested loop concept we discussed last class by creating a program to display the times tables.
  • Name your Java project Multiplication
  • First, the user should see a message like this one appear on the console:
***Time to Learn the Times Table!***

Enter the size of the times table: _
  • Next, use a nested for loop to display the times table for the number entered from 1 to 12 (see example below)
  • To help you get started, you can fill in the missing parts of the code here:

for (int row = ????; row <= 12; row++) { //printing times table 1 through 12
    for (int col = ????; col <= ????; col++) { //for the numbers up to size
        System.out.print( col + " * " + row + "\t"); //add more to this print statement
    }

    System.out.println();

}

  • Now, as an intermediate step, run your code and verify that you get the following output:

***Time to Learn The Times Table!***

Enter the size of the times table: 5
1 * 1     2 * 1     3 * 1     4 * 1     5 * 1   
1 * 2     2 * 2     3 * 2     4 * 2     5 * 2   
1 * 3     2 * 3     3 * 3     4 * 3     5 * 3   
1 * 4     2 * 4     3 * 4     4 * 4     5 * 4   
1 * 5     2 * 5     3 * 5     4 * 5     5 * 5   
1 * 6     2 * 6     3 * 6     4 * 6     5 * 6   
1 * 7     2 * 7     3 * 7     4 * 7     5 * 7   
1 * 8     2 * 8     3 * 8     4 * 8     5 * 8   
1 * 9     2 * 9     3 * 9     4 * 9     5 * 9   
1 * 10    2 * 10    3 * 10    4 * 10    5 * 10   
1 * 11    2 * 11    3 * 11    4 * 11    5 * 11   
1 * 12    2 * 12    3 * 12    4 * 12    5 * 12       

  • Finally, let's alter the print statement inside the for loop so that we print out the products, getting an output like the following:
***Time to Learn The Times Table!***

Enter the size of the times table: 5
1 * 1 = 1      2 * 1 = 2      3 * 1 = 3      4 * 1 = 4      5 * 1 = 5   
1 * 2 = 2      2 * 2 = 4      3 * 2 = 6      4 * 2 = 8      5 * 2 = 10   
1 * 3 = 3      2 * 3 = 6      3 * 3 = 9      4 * 3 = 12     5 * 3 = 15   
1 * 4 = 4      2 * 4 = 8      3 * 4 = 12     4 * 4 = 16     5 * 4 = 20   
1 * 5 = 5      2 * 5 = 10     3 * 5 = 15     4 * 5 = 20     5 * 5 = 25   
1 * 6 = 6      2 * 6 = 12     3 * 6 = 18     4 * 6 = 24     5 * 6 = 30   
1 * 7 = 7      2 * 7 = 14     3 * 7 = 21     4 * 7 = 28     5 * 7 = 35   
1 * 8 = 8      2 * 8 = 16     3 * 8 = 24     4 * 8 = 32     5 * 8 = 40   
1 * 9 = 9      2 * 9 = 18     3 * 9 = 27     4 * 9 = 36     5 * 9 = 45   
1 * 10 = 10    2 * 10 = 20    3 * 10 = 30    4 * 10 = 40    5 * 10 = 50   
1 * 11 = 11    2 * 11 = 22    3 * 11 = 33    4 * 11 = 44    5 * 11 = 55   
1 * 12 = 12    2 * 12 = 24    3 * 12 = 36    4 * 12 = 48    5 * 12 = 60  
  • Note: Part of the output may get cut off if the user enters too large of a number or the numbers might not line up perfectly. Both are okay.
  • When you are finished, submit your assignment to Canvas.

Assignment 14.2: Really Cool Ice Cream (10 pts)

  • Encoding and decoding information can save memory space and speed transmission of data.
  • Waitstaff at ice cream shops often encode orders to reduce writing and speed up customer service.
  • Develop a program that asks a user for a single input -- where the first two characters is a flavor of ice cream in the following shorthand code and the last characters are the number of scoops for the type.
Code Ice Cream Flavor
CHChocolate
CCChocolate Chocolate Chip
CMChocolate Mint
HCHorchata
MCMocha Chip
RRRocky Road
SBStrawberry
VBVanilla Bean


  • For example, the code for twelve scoops of Chocolate Mint is: CM12. Notice there are no spaces between the code and quantity.
  • Name the source code file Icecream.java and include all your code in this single file.
  • Ask the user for the following inputs (and no other input) in this order, as shown in the Example Run below:
    • A single order code like: CM12 (no spaces allowed!!)
    • A 'y' or 'n' (without the quotes) for the repeat loop
  • Also, assume the user enters all the codes with UPPERCASE letters as shown.
  • Store the order code in a single String variable.
    • Then use substring() to analyze and process the input string to print a full description of the ice cream order.
    • Use the length() method so that your program adapts to orders of any size.
    • What happens if a user wants to order 1000 cones of one flavor, 10,000 etc?
  • Add a while statement that allows the user to repeat the program by entering a 'y' (without the quotes).
  • If the user enters an invalid code, display the message, "We don't have that flavor." as shown in the example output.
Your Output Should Look Indentical to the Following (except user input will vary):

Welcome to the Really Cool Ice Creamery!

Enter the ice cream order code: CM12
12 Chocolate Mint
Another order? (y/n) y

Enter the ice cream order code: HC2
2 Horchata
Another order? (y/n) y

Enter the ice cream order code: XY123
We don't have that flavor.
Another order? (y/n) n

Your ice cream order will be right up!

Assignment 14.3: Vowels (10 pts)
  • Write a program that takes in a sentence from the user and then counts the number of vowels in the sentence.
  • The user should be able to enter as many sentences as desired.
  • You will need to use String.charAt(), String.length(), and two loops - a while loop and a for loop to solve this problem correctly.
  • Open up a new Java class file called Vowels.java
  • First, welcome the user to the program and explain its purpose:
Welcome! Give me a sentence and I will count its vowels.
  • Then prompt the user to enter a sentence.
Please enter a sentence or q to quit: |
  • Store the user input as a string variable.
  • Now, using a for loop and the String.length() method, count how many vowels (a, e, i, o, u) there are in the sentence.
  • Note that the program should also count capital vowels (A, E, I, O, U).
  • Finally, output the number of vowels like so:
There are 5 vowels in your sentence.
  • Next, place the prompt and for loop inside of a while loop so that the user can enter multiple sentences.
  • If the user enters q, the loop should end and the program should print out a message "Goodbye!"
  • Once your program is working identically to the examples below, submit it to Canvas.

The output of your program should look identical to the sample output below except user input may vary.

Welcome! Give me a sentence and I will count its vowels.

Please enter a sentence or q to quit: Power to the people!
There are 7 vowels in your sentence.

Please enter a sentence or q to quit: Chillax!
There are 2 vowels in your sentence.

Please enter a sentence or q to quit: Animals are friends not food.
There are 10 vowels in your sentence.

Please enter a sentence or q to quit: q

Goodbye!