hashmap c
#include <stdio.h>
#include <stdlib.h>
struct node
{
int key;
int val;
struct node *next;
};
struct table
{
int size;
struct node **list;
};
struct table *createTable(int size)
{
struct table *t = (struct table *)malloc(sizeof(struct table));
t->size = size;
t->list = (struct node **)malloc(sizeof(struct node *) * size);
int i;
for (i = 0; i < size; i++)
t->list[i] = NULL;
return t;
}
int hashCode(struct table *t, int key)
{
if (key < 0)
return -(key % t->size);
return key % t->size;
}
void insert(struct table *t, int key, int val)
{
int pos = hashCode(t, key);
struct node *list = t->list[pos];
struct node *newNode = (struct node *)malloc(sizeof(struct node));
struct node *temp = list;
while (temp)
{
if (temp->key == key)
{
temp->val = val;
return;
}
temp = temp->next;
}
newNode->key = key;
newNode->val = val;
newNode->next = list;
t->list[pos] = newNode;
}
int lookup(struct table *t, int key)
{
int pos = hashCode(t, key);
struct node *list = t->list[pos];
struct node *temp = list;
while (temp)
{
if (temp->key == key)
{
return temp->val;
}
temp = temp->next;
}
return -1;
}
int main()
{
struct table *t = createTable(5);
insert(t, 2, 3);
insert(t, 5, 4);
printf("%d", lookup(t, 5));
return 0;
}