Initializacia

cv7/program.c

@@ -1,23 +1,26 @@
-#include<stdio.h>
-#include<string.h>
-#include<assert.h>
-#include<stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
 
 #define SIZE 100
 
-struct tree{
+struct tree {
     char value[SIZE];
     struct tree* left;
     struct tree* right;
 };
 
-struct tree* read_tree(){
+struct tree* read_tree() {
     char buffer[SIZE];
-    memset(buffer,0,SIZE);
-    char* r = fgets(buffer,SIZE,stdin);
-    assert(r);
-    struct tree* node = calloc(1,sizeof(struct tree));
-    memcpy(node->value,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;
 }
 
@@ -33,33 +36,47 @@ struct tree* load_tree() {
     return node;
 }
 
-void print_tree(struct tree* tree, int offset){
-    for (int i = 0; i < offset; i++){
-        printf(" ");
+void print_tree(struct tree* tree, int offset) {
+    if (!tree) {
+        return;
     }
-    printf("%s", tree->value);
-    if (tree->left){
+
+    if (tree->value[0] == '*') {
+        printf("Expert z bufetu to vie.\n%s\nKoniec\n", tree->value + 1);
+        return;
+    }
+
+    printf("%s\n", tree->value);
+
+    char response;
+    if (scanf(" %c", &response) != 1 || (response != 'a' && response != 'n')) {
+        printf("Nespravny vstup. Koniec.\n");
+        return;
+    }
+
+    if (response == 'a') {
         print_tree(tree->left, offset + 3);
+    } else {
         print_tree(tree->right, offset + 3);
     }
 }
 
-void destroy_tree(struct tree* tree){
-    if(tree->left != NULL){
+void destroy_tree(struct tree* tree) {
+    if (tree->left != NULL) {
         destroy_tree(tree->left);
     }
-    if(tree->right != NULL){
+    if (tree->right != NULL) {
         destroy_tree(tree->right);
     }
     free(tree);
 }
 
-void count_items(struct tree* tree, int* count){
-    if(tree->left == NULL && tree->right == NULL){
+void count_items(struct tree* tree, int* count) {
+    if (tree->left == NULL && tree->right == NULL) {
         (*count)++;
-    }else{
-	count_items(tree->left, count);
-	count_items(tree->right, count);
+    } else {
+        count_items(tree->left, count);
+        count_items(tree->right, count);
     }
 }
 
@@ -75,7 +92,7 @@ int main() {
     printf("Pozna %d druhov ovocia a zeleniny.\n", count);
     printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");
 
-    print_tree(root);
+    print_tree(root, 0);
 
     destroy_tree(root);
     return 0;