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You are right, everything was fine with getopt. The problem was that the binary file that make was outputting was not the one being used when calling it on the command line, but a previous...

Thank you, just did, but still getting "invalid option --D".

I am using Mac OS X.

Eventually I want to add all ABCD cases, but for now I am giving it just -D1 to parse.

There are no such operations, below is all the code starting from main until the...

Thank you, my bad. I added the ":" after D, but it still displays "invalid option". It should not be a problem with changing argc, right? The next part is this. Not sure if something else is...

I am trying to code for the addition of a new argument to the command line, the option D to a code that already has ABC (below). When I use make to compile it, it displays: invalid option --D. I did...

Indeed, this is what I meant. Fantastic, this worked! Thank you.

Okay, trying. thank you
Input:
7 1
49 0
83 0
5 2
42 0

Hopeful output:
7 0
49 0
83 0
5 2
42 0

Ive been trying to slide the second column one line down while keeping the first one in place. For a start, I tried to see if I can go through every line and print the element located on the line...