c - Am I understanding getopt() correctly?

Question

I'm trying to scan the command line for certain letters, symbols and values. I want to scan for "-w", a number, and "-s". I got a response in my last question, I was told to use getopt() and after a little bit of Googling, I think I might get it, but I'm not sure.

This is what I think I'm doing:

int c = 0; 
int b = argv[2];

while((c = getopt(argc, argv, "-w", "-s", b))

I think I'm scanning argc for "-w", "-s" and the argv[2] value (which is the number). But I do not know if I am using it correctly?

Answer 1

Your while loop should be while ((c = getopt(argc, argv, "w:s:"))

: the colon means it needs an argument. now convert optarg to an integer or whatever you wanted.