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.

Provide a main method named Prog3.java. 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 by 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 cast)
  • 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 Utilize postfix increment/decrement operations and compound assignment operators for all math.

Example: x++ or x+=2.

Mimic the sample session precisely.

SAMPLE SESSION
Sample Session:

Please enter text to encrypt
easter
Please enter shift value
3
BXPQBO
Please enter text to decrypt
bxpqbo
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
QEFPFPXQBPQ
Please enter text to decrypt
qefpfpxqbpq
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
EBIIL
Please enter text to decrypt
ebiil
Please enter shift value
5
ZWDDG
Press any key to continue . . .
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