pizza.c

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

int main(int argc, char *argv[]){
    
    char *delivery = "";
    int thick = 0;
    int count = 0;
    char ch;
    
    while ((ch = getopt(argc, argv, "d:t")) != EOF){
        switch (ch){
            case 'd':
                delivery = optarg;
                break;
            case 't':
                thick = 1;
                break; 
            default:
                fprintf(stderr, "Unknow option: '%s'\n", optarg);
                return 1;
        }
    }

    argc -= optind; 
    argv += optind;

    if(thick)
        puts("Thick crust.");

    if(delivery[0])
        printf("To be delivered %s \n", delivery);

    puts("Ingredients:");

    for(count = 0; count < argc; count++)
        puts(argv[count]);

    return 0;

}