140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAX_LINE_LENGTH 100
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typedef struct Node {
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char text[MAX_LINE_LENGTH];
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struct Node *yes;
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struct Node *no;
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} Node;
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Node* create_node(const char* text) {
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Node *node = (Node*)malloc(sizeof(Node));
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if (!node) {
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fprintf(stderr, "Memory allocation error.\n");
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exit(1);
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}
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strncpy(node->text, text, MAX_LINE_LENGTH);
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node->yes = NULL;
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node->no = NULL;
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return node;
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}
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Node* parse_knowledge_base(FILE *file) {
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char line[MAX_LINE_LENGTH];
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// Считываем строку из файла
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if (!fgets(line, sizeof(line), file) || line[0] == '\n') {
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return NULL;
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}
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// Удаляем символ новой строки
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line[strcspn(line, "\n")] = 0;
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// Создаем узел, проверяем, является ли это ответом (начинается с '*')
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Node *node = NULL;
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if (line[0] == '*') {
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node = create_node(line + 1); // Создаем узел-ответ
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} else {
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node = create_node(line); // Создаем узел-вопрос
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node->yes = parse_knowledge_base(file); // Переход для ответа "да"
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node->no = parse_knowledge_base(file); // Переход для ответа "нет"
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}
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return node;
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}
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int count_products(Node *node) {
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if (!node) return 0;
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if (!node->yes && !node->no) return 1;
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return count_products(node->yes) + count_products(node->no);
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}
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void run_expert_system(Node *node, FILE *input) {
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while (node) {
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if (!node->yes && !node->no) {
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printf("*%s\n", node->text);
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printf("Koniec\n");
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return;
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}
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printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");
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printf("%s\n", node->text);
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char answer;
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if (fscanf(input, " %c", &answer) != 1) {
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printf("Koniec\n");
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return;
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}
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if (answer == 'a') {
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node = node->yes;
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} else if (answer == 'n') {
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node = node->no;
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} else {
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printf("Nespravny vstup.\nKoniec\n");
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return;
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}
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}
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}
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void free_tree(Node *node) {
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if (node) {
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free_tree(node->yes);
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free_tree(node->no);
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free(node);
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}
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}
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void create_default_knowledge_base() {
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FILE *file = fopen("knowledge_base.txt", "w");
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if (!file) {
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perror("Failed to create the knowledge base file");
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exit(1);
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}
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fprintf(file, "Je to ovocie alebo zelenina\n");
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fprintf(file, "*Jablko\n");
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fprintf(file, "*Mrkva\n");
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fprintf(file, "\n");
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fprintf(file, "a\n");
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fclose(file);
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}
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int main() {
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FILE *file = fopen("knowledge_base.txt", "r");
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if (!file) {
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create_default_knowledge_base();
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file = fopen("knowledge_base.txt", "r");
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if (!file) {
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perror("Failed to open the knowledge base file");
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return 1;
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}
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}
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Node *root = parse_knowledge_base(file);
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if (!root) {
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printf("Báza znalostí sa nedá načítať.\n");
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fclose(file);
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return 1;
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}
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printf("Expert z bufetu to vie.\n");
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int product_count = count_products(root);
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printf("Pozna %d druhov ovocia a zeleniny.\n", product_count);
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char line[MAX_LINE_LENGTH];
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while (fgets(line, sizeof(line), file) && line[0] != '\n');
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run_expert_system(root, file);
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free_tree(root);
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fclose(file);
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return 0;
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}
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