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Problem 1

• Submit ex1.c here.
• Knowledge related to command-line arguments is given in lecture slide c13.
• Use functions in ctype.h to check for properties or a character so that the code can be more portable. In some character encodings other than ASCII (such as EBCDIC) letters A to Z are not encoded using consecutive numbers, so code like ch >= 'A' && ch <= 'Z' will not always work.
• Since the string is taken in as a command-line argument, it contains no space or any other whitespace characters like tab and newline.
• For the special character in Requirement 5, it is guaranteed to have the following properties:
  1. You can input it directly using keyboard.
  2. It is visible (i.e. not including control characters and whitespace characters).