Linklist.create contact

Linklist.create contact

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct Contact {
+    char name[50];
+    char phone_number[20];
+    struct Contact* next;
+} Contact;
+
+Contact* createContact(char name[], char phone_number[]) {
+    Contact* newContact = (Contact*)malloc(sizeof(Contact));
+    strcpy(newContact->name, name);
+    strcpy(newContact->phone_number, phone_number);
+    newContact->next = NULL;
+    return newContact;
+}
+
+void addContact(Contact** head, char name[], char phone_number[]) {
+    Contact* newContact = createContact(name, phone_number);
+    if (*head == NULL) {
+        *head = newContact;
+    } else {
+        Contact* current = *head;
+        while (current->next != NULL) {
+            current = current->next;
+        }
+        current->next = newContact;
+    }
+}
+
+void deleteContact(Contact** head, char name[]) {
+    if (*head == NULL) {
+        return;
+    }
+    if (strcmp((*head)->name, name) == 0) {
+        Contact* temp = *head;
+        *head = (*head)->next;
+        free(temp);
+        return;
+    }
+    Contact* current = *head;
+    while (current->next != NULL) {
+        if (strcmp(current->next->name, name) == 0) {
+            Contact* temp = current->next;
+            current->next = current->next->next;
+            free(temp);
+            return;
+        }
+        current = current->next;
+    }
+}
+
+char* searchContact(Contact* head, char name[]) {
+    Contact* current = head;
+    while (current != NULL) {
+        if (strcmp(current->name, name) == 0) {
+            return current->phone_number;
+        }
+        current = current->next;
+    }
+    return NULL;
+}
+
+void displayContacts(Contact* head) {
+    if (head == NULL) {
+        printf("Phone Directory is empty.\n");
+        return;
+    }
+    Contact* current = head;
+    printf("Phone Directory:\n");
+    while (current != NULL) {
+        printf("Name: %s, Phone Number: %s\n", current->name, current->phone_number);
+        current = current->next;
+    }
+}
+
+void menu() {
+    printf("\n-----------------------\n");
+    printf("Phone Directory Menu:\n");
+    printf("1. Add Contact\n");
+    printf("2. Delete Contact\n");
+    printf("3. Search Contact\n");
+    printf("4. Display Contacts\n");
+    printf("5. Exit\n");
+    printf("-----------------------\n");
+}
+
+int main() {
+    Contact* head = NULL;
+    int choice;
+    char name[50], phone_number[20];
+
+    do {
+        menu();
+        printf("Enter your choice: ");
+        scanf("%d", &choice);
+
+        switch (choice) {
+            case 1:
+                printf("Enter name: ");
+                scanf("%s", name);
+                printf("Enter phone number: ");
+                scanf("%s", phone_number);
+                addContact(&head, name, phone_number);
+                printf("Contact added successfully.\n");
+                break;
+            case 2:
+                printf("Enter name to delete: ");
+                scanf("%s", name);
+                deleteContact(&head, name);
+                printf("Contact deleted successfully.\n");
+                break;
+            case 3:
+                printf("Enter name to search: ");
+                scanf("%s", name);
+                char* phone = searchContact(head, name);
+                if (phone != NULL) {
+                    printf("Phone number: %s\n", phone);
+                } else {
+                    printf("Contact not found.\n");
+                }
+                break;
+            case 4:
+                displayContacts(head);
+                break;
+            case 5:
+                printf("Exiting...\n");
+                break;
+            default:
+                printf("Invalid choice. Please try again.\n");
+                break;
+        }
+    } while (choice != 5);
+
+    // Free memory
+    Contact* current = head;
+    while (current != NULL) {
+        Contact* temp = current;
+        current = current->next;
+        free(temp);
+    }
+
+    return 0;
+}