使用C语言创建通讯录链表

以下是使用C语言创建通讯录链表的示例代码：

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

// 定义通讯录结构体
typedef struct AddressBook {
    char name[20];
    char phone[12];
    struct AddressBook* next;
} AddressBook;

// 函数声明
void addContact(AddressBook** head);
void printContacts(AddressBook* head);
void deleteContact(AddressBook** head, char* name);
void searchContact(AddressBook* head, char* name);

int main() {
    AddressBook* head = NULL;
    int choice;

    do {
        printf("\n--通讯录操作--\n");
        printf("1. 添加联系人\n");
        printf("2. 显示所有联系人\n");
        printf("3. 删除联系人\n");
        printf("4. 查找联系人\n");
        printf("5. 退出程序\n");
        printf("请选择要进行的操作：");
        scanf("%d", &choice);

        switch (choice) {
        case 1:
            addContact(&head);
            break;
        case 2:
            printContacts(head);
            break;
        case 3:
            char name[20];
            printf("请输入要删除的联系人姓名：");
            scanf("%s", name);
            deleteContact(&head, name);
            break;
        case 4:
            char searchName[20];
            printf("请输入要查找的联系人姓名：");
            scanf("%s", searchName);
            searchContact(head, searchName);
            break;
        case 5:
            printf("程序已退出。\n");
            break;
        default:
            printf("无效的选项，请重新选择。\n");
            break;
        }
    } while (choice != 5);

    return 0;
}

// 添加联系人
void addContact(AddressBook** head) {
    AddressBook* newContact = (AddressBook*)malloc(sizeof(AddressBook));
    printf("请输入联系人姓名：");
    scanf("%s", newContact->name);
    printf("请输入联系人电话：");
    scanf("%s", newContact->phone);
    newContact->next = NULL;

    if (*head == NULL) {
        *head = newContact;
    } else {
        AddressBook* current = *head;
        while (current->next != NULL) {
            current = current->next;
        }
        current->next = newContact;
    }

    printf("联系人添加成功。\n");
}

// 显示所有联系人
void printContacts(AddressBook* head) {
    if (head == NULL) {
        printf("通讯录为空。\n");
    } else {
        AddressBook* current = head;
        printf("\n--所有联系人--\n");
        while (current != NULL) {
            printf("姓名：%s，电话：%s\n", current->name, current->phone);
            current = current->next;
        }
    }
}

// 删除联系人
void deleteContact(AddressBook** head, char* name) {
    if (*head == NULL) {
        printf("通讯录为空，无法删除联系人。\n");
    } else {
        AddressBook* current = *head;
        AddressBook* previous = NULL;
        while (current != NULL) {
            if (strcmp(current->name, name) == 0) {
                if (previous == NULL) {  // 要删除的是头节点
                    *head = current->next;
                } else {
                    previous->next = current->next;
                }
                free(current);
                printf("联系人删除成功。\n");
                return;
            }
            previous = current;
            current = current->next;
        }
        printf("未找到该联系人。\n");
    }
}

// 查找联系人
void searchContact(AddressBook* head, char* name) {
    if (head == NULL) {
        printf("通讯录为空，无法查找联系人。\n");
    } else {
        AddressBook* current = head;
        while (current != NULL) {
            if (strcmp(current->name, name) == 0) {
                printf("姓名：%s，电话：%s\n", current->name, current->phone);
                return;
            }
            current = current->next;
        }
        printf("未找到该联系人。\n");
    }
}