caesar
caesar <-h/-help/h/help>
caesar <-f/-file/f/file> <filename> <conversion> <key/all>
If no argument is given, the program will prompt the user for text.
If the flag -f and a file name is given, the program will read the text from the file.
To output the help message, provide either -h, -help, h, help as a flag.
The conversion argument can be:
for Caesar encryption: -c -caesar c caesar
for Vigenere encryption: -v -vigenere v vigenere
for Caesar decryption: -d -decrypt d decrypt
For Caesar encryption, the key must be an integer. For Vigenere encryption, the key must be a string of alphabetic characters.
For Caesar decryption, to show all results provide either -a, -all, a or all as a flag.
Otherwise, to not show all results, do not provide any flags.
The program will then carry out the conversion and output the result.