getopt

[Dr Saucie]

Im new to getopt(), I have never used it before and i was just wondering what I am doing wrong here. Here is my code so far....

compiler error

[cat]$ make
gcc -Wall -ansi -pedantic kitty.c -o cat
kitty.c: In function âmainâ:
kitty.c:11: warning: implicit declaration of function âgetoptâ

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

int main(int argc, char * argv[])
{
        char choice;

        /*FILE * fptr;*/
        while (( choice = getopt (argc, argv[1], "AbeEnstTuv")) != -1)
        {

                switch(choice)
                {
                        case 'A':
                        printf("show all\n");
                        break;

                        case 'b':
                        printf("number nonempty output lines\n");
                        break;

                        case 'e':
                        printf("equivalent to -vE\n");
                        break;

                        case 'E':
                        printf("displays $ at end of each line\n");
                        break;

                        case 'n':
                        printf("number all output lines\n");
                        break;

                        case 's':
                        printf("supress repeated empty output lines");
                        break;

                        case 't':
                        printf("equivalent to -vT");
                        break;

                        case 'T':
                        printf("display TAB character as ^I");
                        break;

                        case 'u':
                        printf("ignored");
                        break;

                        case 'v':
                        printf("use ^ and M- notation, except for LFD and TAB");
                        break;

                        default:
                        fprintf(stderr, "%s is not a valid character", &choice);
                        exit(1);
                }
        }
        return 0;
}

[Dr Saucie]

actually i figured out that i was missing an include at the top.