Batman - Code for using structs

// simple code to show stucts and pointers

// Marc Chee (marc.chee@unsw.edu.au)

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

#define MAX_NAME_LENGTH 50
#define MAX_POWER_LENGTH 50
#define MAX_NUM_POWERS 5 

struct person {
    char name[MAX_NAME_LENGTH];
    struct person *secret_identity;
    char powers[MAX_NUM_POWERS][MAX_POWER_LENGTH];
    int num_powers;
    struct person *arch_nemesis;
};

void give_power(char power[MAX_POWER_LENGTH], struct person *hero);
void display_person(struct person *hero);
void setup_person(struct person *hero, char name[MAX_NAME_LENGTH]);

int main(void) {
    struct person bruce;
    setup_person(&bruce, "Bruce Wayne");
    display_person(&bruce);
    
    give_power("Super rich", &bruce);
    display_person(&bruce);
    
    // Tragedy strikes, Bruce's parents are murdered
    // Bruce decides to become a vigilante
    // based on his own fear of bats
    struct person batman;
    setup_person(&batman, "Batman");
    give_power("Fearless", &batman);
    give_power("Ninjitsu", &batman);
    give_power("Tech gadgets", &batman);
    give_power("Brooding", &batman);
    give_power("Gravelly Christian Bale Voice", &batman);
    give_power("Supersonic flight", &batman);
    
    bruce.secret_identity = &batman;
    display_person(&bruce);
    
    // No hero is a true hero without something
    // to fight against
    struct person joker;
    setup_person(&joker, "The Joker");
    give_power("Comedy", &joker);
    give_power("Psychopathic", &joker);
    give_power("Henchmen", &joker);
    batman.arch_nemesis = &joker;
    display_person(&bruce);
}

// give_power will add a power to a person
// It will add the string to the array of strings
// called powers, if the person still has
// space to add powers
void give_power(char power[MAX_POWER_LENGTH], struct person *hero) {
    if (hero->num_powers < MAX_NUM_POWERS) {
        strcpy(hero->powers[hero->num_powers], power);
        hero->num_powers++;
    }
}

// Displays a person's information
// including calling display_person() again
// for their secret identity
void display_person(struct person *hero) {
    printf("Name: %s\n", hero->name);
    printf("Powers:\n");
    int i = 0;
    while(i < hero->num_powers) {
        fputs(hero->powers[i], stdout);
        putchar('\n');
        i++;
    }
    if (hero->secret_identity != NULL) {
        printf("Secret Identity:\n");
        display_person(hero->secret_identity);
    } else {
        printf("-----------\n");
    }
    if (hero->arch_nemesis != NULL) {
        printf("Arch Nemesis:\n");
        display_person(hero->arch_nemesis);
    }
}

void setup_person(struct person *hero, char name[MAX_NAME_LENGTH]) {
    strcpy(hero->name, name);
    hero->secret_identity = NULL;
    hero->num_powers = 0;
    hero->arch_nemesis = NULL;
}