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Command Line Arguments

• The program takes the following command line arguments:
  • An optional -d flag to indicate decryption instead of encryption.
  • An optional encryption key, specified with a -k flag. (If no key is specified, then 3 is used).
  • The input file name.
  • The output file name.
• Examples:

  caesar input.txt encrypt.txt
  caesar -d -k11 encrypt.txt output.txt
  

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