Thread: Problem with fgets and double printing

  1. #1
    Registered User
    Join Date
    Feb 2020

    Question about fgets/arrays

    Hello! I'm trying to read from a text file that's being redirected to my program.

    ./program < test.txt
    The code looks like this:
      // read redirection
      char buffer[50][200] = {0};
      int size = 0;
      while(fgets(buffer[size], 200, stdin) != NULL) {
        printf("%s", buffer[size]);
      printf("\nPrinting Array\n");
      for(int i=0; i < size; i++) {
        printf("%s", buffer[i]);
    Is this the best way to do it? I feel like I have a lot of extra space/size because I'm not sure how long the commands or text file will be. Should I be reading the length of the text file somehow?

    Additionally, I thought of setting the last element to NULL, but apparently I can't do something along the lines of
    buffer[size+1] = NULL;
    Why exactly does C stop me from doing this? And how would I mark the end of the buffer array?
    Last edited by verqe; 02-27-2020 at 01:32 AM.

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