I am working on the load function of pset 5 speller. My code, however, displays an error message when compliling, that basically looks like this:
(.text+0x20): undefined reference to `main' clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [dictionary] Error 1
I believe it has something to do with the way I implemented my functions, but I do not see a problem. Here's my code below:
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "dictionary.h"
typedef struct node
{
bool is_word;
struct node *children[27];
}
node;
node* root;
/**
* Creates a linked list.
*/
node* create(bool is_word)
{
node* new_node = (node*)malloc(sizeof(node));
if (new_node == NULL)
{
exit(0);
}
new_node -> is_word = false;
for (int i = 0; i <= 27; i++)
{
new_node -> children[i] = NULL;
}
return new_node;
}
/**
* Inserts a new node into the linked list.
*/
node* insert(node* head, bool is_word)
{
node* new_node = create(false);
head = new_node;
return head;
}
/**
* Returns true if word is in dictionary else false.
*/
bool check(const char *word)
{
// TODO
return false;
}
/**
* Loads dictionary into memory. Returns true if successful else false.
*/
bool load(const char *dictionary)
{
FILE* dic = fopen(dictionary, "r");
if (dic == NULL)
return false;
node* head = create(false);
head = NULL;
root = head;
for (int b = fgetc(dic); b != EOF; b = fgetc(dic))
{
if (b == '\0')
head -> is_word = true;
else if (head -> children[b - 'a'] == NULL)
head = insert(head -> children[b - 'a'], false);
else
head = head -> children[b - 'a'];
}
return true;
}
