简易通讯录

#include "stdio.h"
#include "stdlib.h"
#include "string.h"

typedef int bool;
#define true 1
#define false 0

typedef struct student
{
    char name[20];
    char phone[20];
    bool flag;
    struct student *next;
}student;
student* Add(student* phead);
student* Find(student *phead);
void Search(student* phead);
void Delete(student *phead);
void Modify(student* phead);
student* Read(student* phead);
void Write(student* phead);
void Show(student *phead);

void Scheclle()
{
    char command[20];
    student* head = NULL;
    printf("===========================================================================\n");
    printf("版本号:v1.0\n");
    printf("开发者:唐正跃\n");
    printf("\n\n\n");
    printf("命令名\t功能\n");
    printf("add\t增加一条记录\n");
    printf("show\t显示所有记录\n");
    printf("find\t查找一条记录\n");
    printf("help\t显示帮助\n");
    printf("delete\t删除一条记录\n");
    printf("update\t更新一条记录\n");
    printf("export\t数据导出\n");
    printf("exit\t应用程序退出\n");
    printf("===========================================================================\n");
    
    head = Read(head);
    while(true)
    {
        printf("\n请输入操作命令:>");
        
        scanf("%s", command);
        if(strcmp(command, "add") == 0)
        {
            head = Add(head);
        }
        else if(strcmp(command, "show") == 0)
        {
            Show(head);
        }
        else if(strcmp(command, "update") == 0)
        {
            Modify(head);
        }
        else if(strcmp(command, "delete") == 0)
        {
            Delete(head);
        }
        else if(strcmp(command, "find") == 0)
        {
            Search(head);
        }
        else if(strcmp(command, "exit") == 0)
        {
            Write(head);
            exit(0);
        }
        else
        {
            printf("对不起，您输入了错误的指令！\n");
        }
    }
}

student* Add(student* phead)
{
    student* pNode;
    pNode = (student*)malloc(sizeof(student));
    printf("请输入姓名:");
    scanf("%s", pNode->name);
    printf("请输入电话号码:");
    scanf("%s", pNode->phone);
    printf("记录 姓名:%s， 电话号码:%s, 将要添加到数据库中\n", pNode->name, pNode->phone);
    pNode->next = NULL;
    pNode->flag = true;
    if(phead == NULL)
    {
        phead = pNode;
    }
    else
    {
        student* p;
        p = phead;
        while(p->next)
        {
            p = p->next;
        }
        p->next = pNode;
    }
    return phead;
}

student* Find(student *phead)
{
    char name[20];
    student *p = NULL;
    printf("请输入要查找的姓名:");
    scanf("%s", name);
    p = phead;
    while(p!=NULL)
    {
        if(strcmp(p->name, name) == 0)
        {
            return p;
        }
        else
        {
            p = p->next;
        }
    }
    return NULL;
}

void Search(student* phead)
{
    student* p = Find(phead);
    if(p == NULL)
    {
        printf("查无记录！\n");
    }
    else
    {
        printf("姓名:%s\t|电话号码:%s\n", p->name, p->phone);
    }
}

void Delete(student *phead)
{
    char command[20];
    student* p = Find(phead);

    if(p!=NULL)
    {
        printf("确认要删除\"姓名:%s|电话:%s\"的记录吗？(yes/no):", p->name, p->phone);
        scanf("%s", command);
        if(strcmp(command, "yes") == 0)
        {
            p->flag = false;
            printf("记录删除完毕!\n");
        }
    }
    else
    {
        printf("查无记录!\n");
    }
}

void Modify(student* phead)
{
    char name[20];
    char phone[20];
    student* p = Find(phead);
    if(p != NULL)
    {
        printf("姓名:%s\t|电话号码:%s\n", p->name, p->phone);
        printf("请输入新的姓名:");
        scanf("%s", name);
        printf("请输入新的电话号码:");
        scanf("%s", phone);
        strcpy(p->name, name);
        strcpy(p->phone, phone);
        printf("修改记录成功！\n");
    }
    else
    {
        printf("查无记录!\n");
    }
}

student* Read(student* phead)
{
    FILE* fp = fopen("data.dat", "rb");
    student* pNode = NULL;
    student* p = phead;
    if(fp == NULL)
    {
        printf("打开文件失败！\n");
        return NULL;
    }
    pNode = (student*)malloc(sizeof(student));
    while(fread(pNode, sizeof(student), 1, fp)>0)
    {
        pNode->next = NULL;
        if(phead == NULL)
        {
            phead = pNode;
            p = phead;
        }
        else
        {
            p->next = pNode;
            p = p->next;
        }
        pNode = (student*)malloc(sizeof(student));
    }
    fclose(fp);
    return phead;
}

void Write(student* phead)
{
    FILE *fp;
    student *p;
    remove("data.dat");
    fp = fopen("data.dat", "ab");
    if(fp == NULL)
    {
        printf("生成文件出错， 无法执行保存操作！\n");
        return;
    }
    p = phead;
    while(p!=NULL)
    {
        if(p->flag)
        {
            fwrite(p, sizeof(student), 1, fp);
        }
        p = p->next;
    }
    fclose(fp);
}

void Show(student *phead)
{
    student* p = phead;
    if(phead == NULL)
    {
        printf("没有数据可以显示！\n");
        return;
    }
    while(p != NULL)
    {
        if(p->flag)
        {
            printf("姓名:%s\t|电话:%s\n", p->name, p->phone);
        }
        p = p->next;
    }
}

int main()
{
    Scheclle();
    return 0;
}