#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<stdbool.h>
#define SIZE 20
struct DataItem{
int data;
int key;
};
struct DataItem* hashArray[SIZE];
struct DataItem* dummyItem;
struct DataItem* item;
int hashCode(int key){
return key % SIZE;
}
struct DataItem* search(int key){
//getthehash
int hashIndex=hashCode(key);
while(hashArray[hashIndex]!=NULL){
if(hashArray[hashIndex]->key==key)
return hashArray[hashIndex];
++hashIndex;
hashIndex%=SIZE;
}
return NULL;
}
void insert(int key,int data)
{
struct DataItem *item=(struct DataItem*) malloc(sizeof(struct DataItem*));
item->data=data;
item->key=key;
int hashIndex=hashCode(key);
while((hashArray[hashIndex]!=NULL) && (hashArray[hashIndex]->key !=-1)){
++hashIndex;
hashIndex%=SIZE;
}
hashArray[hashIndex]=item;
}
struct DataItem *delete(struct DataItem *item)
{
int key=item->key;
int hashIndex=hashCode(key);
while(hashArray[hashIndex]!=NULL)
{
if(hashArray[hashIndex]->key==key)
{
struct DataItem* temp= hashArray[hashIndex];
hashArray[hashIndex]=dummyItem;
return temp;
}
++hashIndex;
hashIndex %=SIZE;
}
return NULL;
}
void display(){
int i=0;
for(i=0;i,i<SIZE;i++){
if(hashArray[i]!=NULL)
printf("(%d,%d)",hashArray[i]->key,hashArray[i]->data);
else
printf("~~");
}
printf("\n");
}
int main(){
dummyItem=(struct DataItem*)malloc(sizeof(struct DataItem*));
dummyItem->data=-1;
dummyItem->key =-1;
insert(1,20);
insert(2,70);
insert(42,80);
insert(12,44);
insert(14,32);
insert(17,11);
insert(13,78);
insert(37,97);
display();
item=search(37);
if(item != NULL){
printf("Element found:%d\n",item->data);
}else{
printf("Element not found\n");
}
delete(item);
item=search(37);
if(item!=NULL){
printf("Element found:%d\n",item->data);
}else{
printf("Element not found");
}
}
