I have a cpp app that reads in a number of files and writes revised output. The app doesn't seem to be able to open a file with a ' in the file name, such as,
N,N'-dimethylethylenediamine.mol
This is the function that opens the file :
Code: // opens mol file, reads in rows to string vector and returns vector vector<string> get_mol_file(string& filePath) { vector<string> mol_file; string new_mol_line; // create an input stream and open the mol file ifstream read_mol_input; read_mol_input.open( filePath.c_str() );
[Code] ....
The path to the file is passed as a cpp string and the c version is used to open the file. Do I need to handle this as a special case? It is possible that there could be " as well, parenthesis, etc.
For my data-structures class, I am attempting to create a binary search tree template to be used to create an AVL tree. I've written a Generic_Tree template for the BST to inherit from, and before I jump into implementing the AVL tree I'm testing the BST member functions. Everything was compiling fine until I added the BST insert() function. Now, I'm getting the following error message from my linker:
undefined reference to 'BST<void>::insert(int, void*)'
So I have a simple calculator that does a few operations (+ - * / %) Pretty basic stuff
I declared int x, y for the numbers, char operation, and float result.
the code is based on switch(operation)
The program is running alright, but when I divide 8/7 it returns 1 as the result, I tried changing the x and y to float but that won't work because of the case '%'
I also tried making local float variables in the case'/' but it won't compile "E2126 Case bypasses initialization of a local variable"
How can I make the division work and return a float value?
It has been a while since I built a binary tree from scratch so I decided to do it. Everything works fine but this one function. When I enter a number to search it just keeps running and allowing me to keep enter numbers.
Code: void tree::search(int key,Node* leaf) { if (leaf == NULL) { std::cout<<"The tree is empty
I have a problem with the C code . I created two functions, one that runs through the tree inorder, the other that returns the maximum value in the tree. The problem is when I use in the main the method "max", which goes in a loop and not print anything on the screen . If I remove the call to method "max" it works fine. Here's the code:
Code:
#include<stdio.h> #include<stdlib.h> #define bool int /* A binary tree tNode has data, pointer to left child and a pointer to right child */ struct tNode {
I've almost got my code working. My issue is, if I type in either one of the first two id numbers, it finds the person and displays as it's supposed to, however if I type any of the last 6 id numbers it says id not found. I've been staring at this forever and can't see what I'm missing />/> ps, I haven't added in all my comments yet Binary tree template
//Binray tree template class #ifndef BINARYTREE_H #define BINARYTREE_H
I need to write a program to find the sum of depths of a binary tree, where a depth is by definition the shortest distance between a node and the root. I am required to code this using recursion.
I was thinking of first coding a helper recursion to find the depth for each node. What would be the best way to do that? If I could move from the node to the root, I believe programming this helper recursion would not be very difficult. Is there a way to progress from the node to the root?
I am having trouble with my deleteNode function, using recursion I am trying to delete a node from a binary tree. My tree is displayed as the following...
Tree: (node)->[left child, right child] (k)->[g,p] (g)->[c,h] (c)->[ ,e]
[Code]....
The result did show that it is erased but when I try to add the erase node "t" back into the tree it still exist. I am stumped on what to do when using recursion way of deleting node.
template <typename T> void insert(BTree<T>* tree, T item) { if (tree == nullptr) { tree = new BTree<T>(item); } else if (item < tree->val) { insert(tree->left, item); } else { insert(tree->right, item); } }
I think this function may not be working because I am modifying `tree`, which is a local variable. How do I actually modify the current pointer that `tree` represents, not just `nullptr`?
How to store values from a .txt file delimited with semicolons (;) into a class which is then stored into a Binary Search Tree. After browsing Google for a few hours, and trying various examples of people using Vectors, I just can't seem to get my program to work using Object Oriented Programming with an instance of the class Person.
My two classes are Person, and BinarySearchTree as follows:
class Person{ private: string first_surname; string second_surname; string name; int ID;
[Code] ....
Ok so my text file saves the data of each person in the same order as the class with each value separated by a semicolon.
i.e. First_Surname;Second_Surname;Name;ID;Telephone;Score;
void fillTree( BinarySearchTree *b) { string input[7]; Person p; fstream file("scores.txt", ios::in); // reads text file if(file.is_open()) {
[Code] ....
I understand that I get an error because a vector is saved as integers, and I am using strings, my question is, any other way to read the .txt file and save each data separated by a semicolon, into the Person class?
I'm trying to implement a binary tree using this class:
class btree { public: int key; btree *left; btree *right; btree(){left=NULL; right=NULL;} void insert(int key);
[Code] ....
gives me the following error:
albero_binario1.cpp: In member function ‘void btree::insert(int)’: albero_binario1.cpp:34:18: error: lvalue required as left operand of assignment albero_binario1.cpp:39:15: error: request for member ‘insert’ in ‘((btree*)this)->btree::right’, which is of non-class type ‘btree*’ albero_binario1.cpp:41:14: error: request for member ‘insert’ in ‘((btree*)this)->btree::left’, which is of non-class type ‘btree*’