final

cv8/program.c

@@ -12,8 +12,9 @@ struct tree {
 
 struct tree* read_tree(int* counter){
    
-    
+    //read one node
     int* c = counter;
+    
     //printf("%d\n", *c);
     char buffer[50];
     memset(buffer,0,50);
@@ -26,24 +27,39 @@ struct tree* read_tree(int* counter){
         exit(0);
     }
     
+     
     if(buffer[0] != '\0'){
         struct tree* node = calloc(1,sizeof(struct tree));
         memcpy(node->value, buffer,50);
+        
+        //count all nodes
         *c += 1;
         counter = c;
+        
+        //until i find "*", recursively read tree
         if(buffer[0] != '*'){ 
+            
+            //first check left side, if the isn't node, add it
             if(node->left == NULL){
                 node->left = read_tree(counter);   
             }
+            
+            //than check right side
             if(node->right == NULL){    
                 node->right = read_tree(counter);
             }
         }
+        
+        //if i found root with left and right node, decrease my counter
         if(node->left != NULL && node->right != NULL){
             *c -= 2;
             counter = c;
         }
+         
+        //if binary tree is okay, than counter is 1(there is one root)
         if(*c == 1){
+              
+              //if the user still inseting, than the databaze wrong
               r = fgets(buffer,50, stdin);  
               int x = strlen(buffer);
               buffer[x-1]='\0';
@@ -59,35 +75,38 @@ struct tree* read_tree(int* counter){
 }
 void search(struct tree* this){
     
- 
-    char buffer[5];
-    memset(buffer,0,5);
-    char* r = fgets(buffer,5,stdin);       
+    //read answer
+    char answer[5];
+    memset(answer,0,5);
+    char* r = fgets(answer,5,stdin);       
 
     if(r == NULL){
         printf("Koniec vstupu\n");
         exit(0);
     }
-    if(buffer[0] == '\n'){
+    
+    if(answer[0] == '\n'){
         search(this);
     }
-    /*if(buffer[0] != 'a' || buffer[0] != 'n' || buffer[0] != '\n'){
-       printf("Nerozumiem\n");
-       exit(0);
-    }*/
         
-        if(buffer[0] == 'a'){
+        if(answer[0] == 'a'){
+           
+           //if left node is answer, print it and end the program    
            if(this->left->value[0] == '*'){
                 printf("%s\n", this->left->value);
                 printf("Koniec\n");
                 exit(0);
             }
+            
+            //else print it and continue searching 
             printf("%s\n", this->left->value);
             search(this->left);
 
         }
          
-        else if(buffer[0] == 'n'){ 
+        else if(answer[0] == 'n'){ 
+            
+            //the same for the right side
             if(this->right->value[0] == '*'){
                 printf("%s\n", this->right->value);
                 printf("Koniec\n");
@@ -98,26 +117,19 @@ void search(struct tree* this){
 
        }
    else{
+       
+       //if input is wrong
        printf("Nerozumiem\n");
        exit(0);
    } 
 }
 
-void print_tree(struct tree* tree,int offset){
-    int i;
-    for (i = 0; i < offset; i++){
-        printf(" ");
-    }
-    printf("%s",tree->value);
-    if (tree->left){
-        print_tree(tree->left,offset +3);
-        print_tree(tree->right,offset +3);
-    }
-} 
-
 void destroy_tree(struct tree* root){
+    
+    //if root is NULL,than tree is empty
     if(root == NULL) return;
     
+    //go to the left side and than to the right
     destroy_tree(root->left);
     destroy_tree(root->right);   
     free(root);
@@ -125,10 +137,14 @@ void destroy_tree(struct tree* root){
 }
 int count_leaves(struct tree* node){
     int count = 0;
+     
+    //if left and right nodes are empty
     if(node->left == NULL && node->right == NULL){
-        count = 1;
+        count++;;
     } 
     else{
+        
+        //if left isn't NULL than count 
         if(node->left != NULL){
             count += count_leaves(node->left);
         }
@@ -143,13 +159,14 @@ int count_all(struct tree* node){
     if(node == NULL){
         return 0;
     }
-    int count = 1;
+    int count = 0;
     if(node->left != NULL){
         count += count_all(node->left);
     }
     if(node->right != NULL){
         count += count_all(node->right);
     }
+    count++;
     return count;
 }