Description of the project
CPE 353-01 Software Design and Engineering, Fall 2009
University of Alabama in Huntsville
Project #1 (10 points) – Caesar Cipher Dialog v1.0
1. Assignment Due Date 09/18/2009 by Noon
2. Assignment Description
Manually code a Qt4 dialog that will allow one to encrypt or decrypt a word using a Caesar Cipher. With a Caesar Cipher, an integer key value is used to specify the amount of shift between the plaintext and ciphertext alphabets. For example, assume that the key value is 2.
To encrypt a plaintext word, substitute each plaintext letter from the word with the corresponding letter from the ciphertext alphabet. In this case, "hello" would become "jgnnq". Decryption works in the opposite direction – from ciphertext alphabet back to plaintext alphabet.
The dialog should display one QSpinBox and two QLineEdit widgets (with matching labels). The spin box specifies an integer value that indicates the desired alphabet shift (encryption/decryption key) for the Caesar Cipher. One line edit will be used to input or display the plaintext (unencrypted) word, and the second line edit will be used to input or display the ciphertext (encrypted) word. All line edits should be limited to lower case letters only, and the maximum number of input characters is 26.
Three QPushButtons will be needed on this dialog. The Quit button to allows the user to terminate the program, and the Clear button allows the user to erase all text content in the plaintext and ciphertext line edits . The third button changes between encryption and decryption modes. In addition to changing the operating mode, pressing of the third button updates the key label and third button text (see examples on following page) to reflect the current mode.
When in encryption mode, one may only type in the plaintext line edit – the ciphertext line edit should not allow typing. Instead, as one types in the plaintext edit, the encrypted characters appear in the ciphertext edit. When in decryption mode, one may only type in the ciphertext line edit – the plaintext line edit should not allow typing. As characters are entered into the ciphertext line edit, the equivalent decrypted characters appear in the plaintext line edit. A change in the spin box value should trigger updates in the appropriate plain/cipher text line edits.
Hint: The text in a line edit is stored as a QString. As with C++ strings the [ ] operator may be used to index into a QString value to retrieve a QChar. The QChar method unicode() may be used to retrieve the unicode integer representation of the character.
You can use this integer representation to help you compute the equivalent ciphertext/plaintext character. Don't forget to wrap when needed.
3. Upload all project files (*.cpp, *.pro, .h, etc.) to the Angel Dropbox for Project1.
You may develop your product on any platform you choose (Linux, Mac OS X, Windows), but it will be graded on the Linux machine blackhawk.eng.uah.edu so be sure to verify operation on blackhawk prior to submission.
4. Assignment Constraints
Widget Restrictions:
You may only use widgets we have seen thus far (Chapters 1-3 or in lecture note examples) or your own widgets that you have derived from them.
Examples: QDialog, QLabel, QLineEdit, QPushButton, QHBoxLayout, QVBoxLayout, QGridLayout, QSpinBox, etc.
Development Tool Restrictions:
You must manually code all classes, including the GUI code, on this assignment. Youare allowed to use qmake to automatically generate project and makefiles.
Miscellaneous Constraints:
• You must manually-generate all code for this assignment ? no Qt Designer
You will receive zero credit (0) for using Qt Designer on this assignment.
• No memory leaks allowed
• Your program must be cross-platform compatible (Linux, Windows, or Mac OS X).
You have access to the Linux system blackhawk.eng.uah.edu for development and testing.
Solution
This program has been created with this version of Qt:
Open the program, click on File, New…, select an Empty Qt4 Project:
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