Data_Structures/HashTables/Hash_Tables_Using_Chaining.cpp at main · StyNW7/Data_Structures · GitHub

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#include<stdio.h>
#include<string.h>
#include<stdlib.h>


constintSIZE = 10;


structPerson {

int age;
char name[101];
	Person *next, *prev;

} *head[SIZE], *tail[SIZE], *curr;


structPerson* createNewNode (char name[], int age){

	Person *newNode = (Person*) malloc(sizeof(Person));

strcpy (newNode->name, name);
	newNode->age = age;
	newNode->next = NULL;
	newNode->prev = NULL;

return newNode;

}


inthash (char name[]){

int key = 0;

for (int i = 0; i < strlen(name); i++){
 key += name[i];
	}

return (key % SIZE);

}


voidpush (char name[], int age){

	Person *node = createNewNode (name, age);
int index = hash(name);

// Push Head

if (head[index] == NULL){
 head[index] = tail[index] = node;
	}

// Push Tail

else {

 tail[index]->next = node;
 node->prev = tail[index];
 tail[index] = node;

 tail[index]->next = NULL;

	}

}


voidpop (char name[]){

int index = hash(name);

if (head[index] == NULL && tail[index] == NULL){
printf ("There is no such data..."); getchar();
return;
	}

// Pop 1

elseif (head[index] == tail[index] && strcmp (head[index]->name, name) == 0){
free (head[index]);
 head[index] = tail[index] = NULL;
	}

// Pop Head

elseif (strcmp (head[index]->name, name) == 0){

 head[index] = head[index]->next;
free (head[index]->prev);
 head[index]->prev = NULL;

	}

// Pop Tail

elseif (strcmp (tail[index]->name, name) == 0){

 tail[index] = tail[index]->prev;
free (tail[index]->next);
 tail[index]->next = NULL;

	}

// Pop Mid

else {

 curr = head[index];

while (curr != NULL && strcmp(curr->name, name) != 0){
 curr = curr->next;
 }

if (curr){
 Person *a = curr->prev;
 Person *del = curr;
 Person *b = curr->next;

 a->next = b;
 b->prev = a;

free (del);
 }

	}

printf ("Press enter to continue..."); getchar();

}


voidview (){

for (int i = 0; i < SIZE; i++){

printf("[%d] >> ", i);

 Person *curr = head[i];

while (curr) {
printf("[%d | %s] >> ", curr->age, curr->name);
 curr = curr->next;
 }

printf("\n");

	}

}


intmain(){

int menu;

while (true){

system ("cls");

puts ("HASH TABLE CHAINING");
puts ("=============================");

view ();

puts ("=============================\n");

printf ("1. Push\n");
printf ("2. Pop\n");
printf ("3. Exit\n");

printf ("\n>> ");

scanf ("%d", &menu);
getchar();

if (menu == 1) {

int age;
char name[101];
system ("cls");

printf ("Input name: ");
scanf ("%s", name); getchar();
printf ("Input age: ");
scanf ("%d", &age); getchar();

push (name, age);

 }

elseif (menu == 2) {

int age;
char name[101];
system ("cls");

printf ("Input name: ");
scanf ("%s", name); getchar();

pop (name);

 }

elseif (menu == 3) break;

	}

system ("cls");

printf ("Thank youu :)\n");

return0;

}