通讯录管理系统c语言

好的，您想了解通讯录管理系统的C语言实现。通讯录管理系统可以用来存储联系人的姓名、电话号码、地址等信息，并且可以进行添加、删除、修改、查询等操作。以下是一个简单的通讯录管理系统的C语言实现。

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

#define MAX_CONTACTS 100

struct contact {
    char name[50];
    char phone[20];
    char address[100];
};

struct contact contacts[MAX_CONTACTS];

int num_contacts = 0;

void add_contact() {
    if (num_contacts == MAX_CONTACTS) {
        printf("The contact list is full.\n");
        return;
    }

    struct contact new_contact;

    printf("Enter the name: ");
    scanf("%s", new_contact.name);

    printf("Enter the phone number: ");
    scanf("%s", new_contact.phone);

    printf("Enter the address: ");
    scanf("%s", new_contact.address);

    contacts[num_contacts++] = new_contact;

    printf("Contact added.\n");
}

void delete_contact() {
    if (num_contacts == 0) {
        printf("The contact list is empty.\n");
        return;
    }

    char name[50];

    printf("Enter the name of the contact to delete: ");
    scanf("%s", name);

    int found = 0;

    for (int i = 0; i < num_contacts; i++) {
        if (strcmp(name, contacts[i].name) == 0) {
            found = 1;

            for (int j = i; j < num_contacts - 1; j++) {
                contacts[j] = contacts[j + 1];
            }

            num_contacts--;

            printf("Contact deleted.\n");

            break;
        }
    }

    if (!found) {
        printf("Contact not found.\n");
    }
}

void modify_contact() {
    if (num_contacts == 0) {
        printf("The contact list is empty.\n");
        return;
    }

    char name[50];

    printf("Enter the name of the contact to modify: ");
    scanf("%s", name);

    int found = 0;

    for (int i = 0; i < num_contacts; i++) {
        if (strcmp(name, contacts[i].name) == 0) {
            found = 1;

            printf("Enter the new phone number: ");
            scanf("%s", contacts[i].phone);

            printf("Enter the new address: ");
            scanf("%s", contacts[i].address);

            printf("Contact modified.\n");

            break;
        }
    }

    if (!found) {
        printf("Contact not found.\n");
    }
}

void display_contact() {
    if (num_contacts == 0) {
        printf("The contact list is empty.\n");
        return;
    }

    for (int i = 0; i < num_contacts; i++) {
        printf("Name: %s\n", contacts[i].name);
        printf("Phone: %s\n", contacts[i].phone);
        printf("Address: %s\n", contacts[i].address);
        printf("\n");
    }
}

int main() {
    int choice;

    while (1) {
        printf("1. Add a contact\n");
        printf("2. Delete a contact\n");
        printf("3. Modify a contact\n");
        printf("4. Display all contacts\n");
        printf("5. Exit\n");

        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_contact();
                break;

            case 2:
                delete_contact();
                break;

            case 3:
                modify_contact();
                break;

            case 4:
                display_contact();
                break;

            case 5:
                exit(0);

            default:
                printf("Invalid choice.\n");
        }

        printf("\n");
    }

    return 0;
}

这个通讯录管理系统使用了一个结构体 `contact` 来存储每个联系人的信息，包括姓名、电话号码和地址。在主函数中，使用一个循环来显示菜单，让用户可以选择进行添加、删除、修改、查询等操作。每个操作都对应一个函数，实现相应的功能。需要注意的是，这个通讯录管理系统最多只能存储100个联系人的信息。