usaa24/cv7/program.c

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

#define SIZE 100

struct tree {
    char value[SIZE];
    struct tree* left;
    struct tree* right;
};

struct tree* read_tree() {
    char buffer[SIZE];
    memset(buffer, 0, SIZE);
    char* r = fgets(buffer, SIZE, stdin);
    if (!r || buffer[0] == '\n') {
        return NULL;
    }
    buffer[strcspn(buffer, "\n")] = 0;
    struct tree* node = calloc(1, sizeof(struct tree));
    strncpy(node->value, buffer, SIZE - 1);
    return node;
}

struct tree* load_tree() {
    struct tree* node = read_tree();
    if (!node) {
        return NULL;
    }
    if (node->value[0] != '*') {
        node->left = load_tree();
        node->right = load_tree();
    } else if (node->left != NULL || node->right != NULL) {
        printf("Expert z bufetu to vie.\n");
        free(node);
        return NULL;
    }
    return node;
}

void run_tree(struct tree* tree) {
    if (!tree) {
        return;
    }

    if (tree->value[0] == '*') {
        printf("*%s\nKoniec\n", tree->value + 1);
        return;
    }

    printf("%s\n", tree->value);

    char response;
    if (scanf(" %c", &response) != 1) {
        printf("Koniec vstupu\n");
        return;
    } else if (response != 'a' && response != 'n') {
        printf("Nerozumiem\n");
        return;
    }

    if (response == 'a') {
        run_tree(tree->left);
    } else {
        run_tree(tree->right);
    }
}

void destroy_tree(struct tree* tree) {
    if (tree) {
        destroy_tree(tree->left);
        destroy_tree(tree->right);
        free(tree);
    }
}

void count_items(struct tree* tree, int* count) {
    if (tree) {
        if (tree->left == NULL && tree->right == NULL) {
            (*count)++;
        } else {
            count_items(tree->left, count);
            count_items(tree->right, count);
        }
    }
}

int main() {
    struct tree* root = load_tree();
    
    if (!root) {
        printf("Chybna databaza\n");
        return 0;
    }

    printf("Expert z bufetu to vie.\n");

    int count = 0;
    count_items(root, &count);
    printf("Pozna %d druhov ovocia a zeleniny.\n", count);
    printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");

    run_tree(root);

    destroy_tree(root);
    return 0;
}