HOW TO RUN A C++ PROGRAM WITH INPUT AND OUTPUT FILES
- there are at least three ways to specify an input file
and an output file at run time

(1) program can prompt and ask for the name of the file 
at run time.  We will not use this method in CS 330.

(2) the command to start the program can redirect the
input to come from a file and the output to go to a file.
	% ./myprog <myinputfile.txt  >myoutputfile.txt
where 
myprog is the name of our comiled executable file, 
myinputfile.txt is an input file, and 
myoutputfile.txt is an output file.

The output file will be created as necessary.

(3) the program can accept a command-line argument
via the argc and argv parameters to main. In this case,
the Linix operating system looks at the word(s)
after the program name on the command line, e.g.
	% ./myprog myfile.txt
where myprog is our compiled executable file and myfile.txt is a 
command-line argument).

Following is a brief description of options 2 and 3

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I/O REDIRECTION:

- In previous terms, some people have asked about 
using input and output redirection, for preliminary debugging.

On replit
	g++ myprogram.cpp -o myprogram
	./myprogram <in1-01.txt >out1-01.txt

On Visual C++
	In Project / Settings / Debug / Program Arguments
	Put this text:
		<in1-01.txt >out1-01.txt

Note:  no space after the "<" and ">" symbols for Visual C++.
On replit, you can put spaces.

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COMMAND-LINE ARGUMENTS:

- For the CS330 project, for Phase 2 and 3 you are required to use 
command-line arguments. You will pass the name of 
the input and output files as arguments to your program

	% ./phase1 in1-01.txt out1-01.txt

If you start your program this way, 
argv[0] will be the C-string "phase1" (or maybe it is "./phase1"), 
argv[1] will be "in1-01.txt", and 
argv[2] will be "out1-01.txt".

- on Visual C++
	In Project / Settings / Debug / Program Arguments
Put this text:

		in1-01.txt out1-01.txt

to pass 2 C-strings to the program as argv[1] and argv[2].

- more details are given in a separate file concerning
command line arguments.
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