usaa20/cv8/program.c

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

struct tree {
    char value[50];
    struct tree* left;
    struct tree* right;
};


struct tree* read_tree(){
    char buffer[50];
    memset(buffer,0,50);
    char* r = fgets(buffer,50,stdin);
    int x = strlen(buffer);
    buffer[x-1]='\0'; 
    
    assert(r);
    
    if(buffer[0] != '\0'){
        struct tree* node = calloc(1,sizeof(struct tree));
        memcpy(node->value, buffer,50);
        if(buffer[0] != '*'){ 
            if(node->left == NULL){
                node->left = read_tree();   
            }
            if(node->right == NULL){    
                node->right = read_tree();
            }
        }
        return node;
    }

}
struct tree* search(struct tree* this){
    
    char c = getchar();
      
    if(this->left != NULL && this->right != NULL){
        if(c == 'a'){
            printf("%s\n", this->left);
            this->left = search(this->left);
        }
        else if(c == 'n'){
            printf("%s\n", this->right);
            this->right = search(this->right); 
        } 
    
    }
}
 

void destroy_tree(struct tree* root){
    if(root == NULL) return;
   
    destroy_tree(root->left);
    destroy_tree(root->right);   
    free(root);
    root = NULL;
}
int count_leaves(struct tree* node){
    int count = 0;
    if(node->left == NULL && node->right == NULL){
        count = 1;
    } 
    else{
        if(node->left != NULL){
            count += count_leaves(node->left);
        }
        if(node->right != NULL){
            count += count_leaves(node->right);
        }   
    }
    return count;

}
int count_all(struct tree* node){
    if(node == NULL){
        return 0;
    }
    int count = 1;
    if(node->left != NULL){
        count += count_all(node->left);
    }
    if(node->right != NULL){
        count += count_all(node->right);
    }
    return count;
}


int main(){
    struct tree* tree = NULL;
    tree = read_tree();
    int count = count_leaves(tree);
     
    printf("Expert z bufetu to vie.\n");
    printf("Pozna %d druhov ovocia a zeleniny.\n", count);
    printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");
    printf("%s\n", tree->value);   
    tree = search(tree);   
    destroy_tree(tree);
    printf("Koniec\n");     
    return 0;
}