Update cv7/program.c

cv7/program.c

@@ -20,7 +20,11 @@ struct tree* read_tree()
     memset(buffer,0,SIZE);
     char* r = fgets(buffer,SIZE,stdin);    
         
+  
     assert(r);
+
+    if(buffer[0]=='\n')
+        return NULL;
     struct tree* node = (struct tree*)calloc(1,sizeof(struct tree));
     memcpy(node->value,buffer,SIZE);
   
@@ -53,6 +57,13 @@ void print_tree(struct tree* tree,int offset){
     }
 }
 
+void destroy_tree(struct tree* tree){
+    if(tree==NULL) return;
+
+    destroy_tree(tree->left);
+    destroy_tree(tree->right);
+    free(tree);
+}
 
 int main(void)
 {
@@ -83,10 +94,9 @@ int main(void)
         
     }while(1);
   
-    
     printf("Koniec\n");
+    destroy_tree(tr);
+    tr=NULL;
 
   return 0;
 }
-
-