Using the vi editor, write a C program on the Sun cluster that prompts the user for an input file name and an output file name. The input file should contain words (text) in any format. A word is defined as any string of characters separated from other strings of characters by one or more blanks, tabs, or newlines. The output file created by your program should contain the same words in the same order as the input file, but each line of the output file except that last should contain exactly 5 words. The last line of words in the output file will contain less than 5 words if the number of words in the input file is not a multiple of 5. The final line of the output file should contain a count of the total number of words in the input file.

More detailed specifications include:

• The program must check that the input file and output file are opened correctly. If not, the program should prompt for another file name. See:

  ~taw2/pub/fileadd.c

  for an example of how to do this.
• The program should work correctly if the input file exists, but is empty. That is, it should create an output file containing nothing except the sum of the total number of words in the input file (0).
• The program may assume that no word in the input file contains more than 40 characters.
• Words on the same line in the output file should be separated by a single space, no matter how many spaces, tabs, and newlines separated them in the input file.
• The file:

  ~taw2/pub/outwprog4

  contains the result of running my program for this assignment on the file:

  ~taw2/pub/prog4.c

• For 5 points extra credit, modify your program so that if the output file name entered by the user is the name of a file that already exists, your program notifies the user of this fact and asks the user to confirm that this file should be used. If the user decides not to use this file as the output file, your program should prompt the user for another output file name.
• To hand in:
  • Either turn in a print out of your source code, or email me (wahls@psu.edu) the file containing your source code. If you email me the program, I will email you your score and any comments on your program sometime after the due date. I will also save a copy of your program to prevent later disputes.
  • Your code will be graded on correctness, programming style, readability, the clarity of messages printed for the user and appropriate use of comments.

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