Argument parsing in C

args-parser.c

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

int main(int argc, char ** argv)
{
    const char * mystr = "default";
    int myint = 0;
    float myfloat = 0.0;
    bool mybool = false;

    opterr = 0;

    int opt;
    while ((opt = getopt(argc, argv, "bi:f:s:")) != -1)
    {
        switch (opt)
        {
            case 'b':
                mybool = true;
                break;
            case 'i':
                myint = atof(optarg);
                break;
            case 'f':
                myfloat = atof(optarg);
                break;
            case 's':
                mystr = optarg;
                break;
            case '?':
                printf("unknown option [%c]", optopt);
                break;
        }
    }

    printf("options:\n"
           "mystr: [%s]\n"
           "mybool: [%d]\n"
           "myint: [%d]\n"
           "myfloat: [%f]\n",
           mystr, mybool, myint, myfloat);
}