DUE SUNDAY, SEPTEMBER 8, 2013 DIRECTIONS (5% grade) The file must be called <You

Question

DUE SUNDAY, SEPTEMBER 8, 2013

DIRECTIONS (5% grade)

The file must be called <YourNameChapter12.java>

Example: LastnameFirstnameChpater12.java

Ensure you include ALL files required to make your program compile and run.  

Proper coding conventions required the first letter of the class start with a capital letter and first letter of each additional word start with a capital letter.

STYLE REQUIREMENTS (10% grade)

Refer to the Java Coding Conventions Document.

Add comments as required for all .java files.

IMPORTANT:  Input format must be correct (i.e., tabbed and columned correctly, NOT left justified)

OVERALL REQUIREMENTS

Provide a complete program that performs a simple substitution cipher.  The program should take plain text and a shift value and produce the encrypted text.  Then it should take encrypted text and a shift value and produce the plain text once again.  A different encrypted text and shift can be entered so make sure to get input.  

Example:

EASTER shifted by 3 to left would become HDVWHU

HDVWHU shifted by 3 to right would become EASTER

This is how the early Caesar Cipher worked.

YourNameChapter12.java (80% grade)

Provide a main method. It should:

- Get input for a string and a shift value

- Convert to upper case

- Only perform the following items on alphabetic characters between A and Z

- Utilize a for loop which uses postfix incrementing operator

   = Convert character to its ASCII equivalent (type cast)

   = Shift buy shift value entered above

      - If you reach end of alphabet, wrap around

      - Example: A shifted to the left 2 would become Y

      - Convert back to its character equivalent (type fast)

      - Output the new character

- Get input for a string and a shift value

- Perform same steps above to convert the encrypted text back to plain text

- Be sure to get input again as a different encrypted text may be entered

- Main method can call separate method to perform encryption/decryption but not required.

Utilize postfix increment/decrement operations and compound assignment operators for all math.  Example: x++ or x+=2

Mimic the sample session precisely

UPLOAD YOUR PAGE TO THE DROPBOX

NOTE:  Complete your activity and submit it to the Dropbox (5% grade)

TOTAL POINTS: 100%

SAMPLE SESSION:

Please enter text to encrypt

easter

Please enter shift value

3

HDVWHU

Please enter text to decrypt

hdvwhu

Please enter shift value

-3

EASTER

Press any key to continue . . .

SAMPLE SESSION 2: : (Notice spaces removed from input)

Please enter text to encrypt

This Is A Test

Please enter shift value

3

WKLVLVDWHVW

Please enter text to decrypt

WKLVLVDWHVW

Please enter shift value

-3

THISISATEST

Press any key to continue . . .

Sample Session 3: (Notice the different shift and decrypt value)

Please enter text to encrypt

hello

Please enter shift value

3

KHOOR

Please enter text to decrypt

khoor

Please enter shift value

-5

FCJJM

Press any key to continue . . .

Explanation / Answer

Can be done. Will give you the code in sometime

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