通讯录.cpp

也是用C语言编写的通讯录小程序

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#define NULL 0
#define LEN sizeof(struct student)

void save(struct node *p);
void creat();
void print();
void del();
void insert();
struct node * read();
struct student
{
    char name[10];
    char telephone[10];
    char address[40];
    char postnum[10];
};
struct node
{
    struct student *stu;
    struct node *next;
};
int n;
void save(struct node *p)
{
    FILE *fp;
    if((fp=fopen("file.txt","w"))==NULL)
        printf("open file error!");
    else
        while(p)
        {
            fwrite(p->stu,LEN,1,fp);
            p=p->next;
        }
    fclose(fp);
}
struct node * read()    
{
    FILE *fp;
    struct node *head,*p;
    struct student *student;
    head=p=(struct node *)malloc(sizeof(struct node));
    student=(struct student *)malloc(LEN);
    if((fp=fopen("file.txt","r"))==NULL)
        return NULL;
    do
    {
        fread(student,LEN,1,fp);
        p->stu=student;
        p->next=(struct node *)malloc(sizeof(struct node));
        student=(struct student *)malloc(LEN);
        p=p->next;
    }while(!feof(fp));
    p=NULL;
    fclose(fp);
    return head;
}
void creat()
{
    int n=0;
    struct node *head,*p;
    struct student *s;
    head=p=(struct node *)malloc(sizeof(struct node));
    s=(struct student *)malloc(LEN);
    printf("Input students' name,telephone,address and postcode:\n");
    printf("Number %d\n",n+1);
	n++;
    printf("name      :");
    getchar();gets(s->name);
    if(!strcmp(s->name,"exit"))
        head=NULL;
    else
    {
        printf("telephone :");gets(s->telephone);
        printf("address   :");gets(s->address);
        printf("postnumber:");gets(s->postnum);
        p->stu=s;
        while(1)
        {
            p=p->next=(struct node *)malloc(sizeof(struct node));
            s=(struct student *)malloc(LEN);
            printf("\nNumber %d\n",n+1);
            printf("name      :");gets(s->name);
            if(!strcmp(s->name,"exit"))
                break;
            printf("telephone :");gets(s->telephone);   
            printf("address   :");gets(s->address);
            printf("postnumber:");gets(s->postnum);
            p->stu=s;
            n++;
        }
        p=NULL;
    }
    save(head);
}
void print()
{
    int i=1;
    struct node *p;
    p=read();
    printf("\nNow,these records are:\n");
    printf("          Name\t  telephone address postnumber\n");
    if(p!=NULL)
        do
        {
            printf("Number %d:",i++);
            printf(" %-8s%-8s  %-8s%-8s\n",p->stu->name,p->stu->telephone,p->stu->address,p->stu->postnum);
            p=p->next;
        }while(p);
}
void del()
{
    struct node *head,*p1,*p2;
    char name[10];
    head=read();
    if(head==NULL)
        printf("\nlist null!\n");
    else
    {
        p2=p1=head;
        printf("input the name you want to del:");
        scanf("%s",name);
        while((!strcmp(name,p1->stu->name))&&(p1->next!=NULL))
        {
            p2=p1;p1=p1->next;
        }
        if(!strcmp(name,p1->stu->name))
        {
            if(p1==head)head=p1->next;
            else p2->next=p1->next;
            printf("delete:%s\n",name);
        }
        else printf("can't find name:%s!\n",name);
    }
    save(head);
}
void insert()
{
    struct node *p,*head;
    struct student *s;
    if((head=p=read())==NULL)
        printf("error!");
    while(p->next!=NULL)
        p=p->next;
    p=p->next=(struct node *)malloc(sizeof(struct node));
    s=(struct student *)malloc(LEN);
    printf("input the student's Name telephone address and postcode\n");
    printf("Name:");getchar();gets(s->name);
    printf("telephone:");gets(s->telephone);
    printf("address:");gets(s->address);
    printf("postcode:");gets(s->postnum);
    p->stu=s;
    p->next=NULL;
    save(head);
}
void printmenu()
{
    printf("Input number to choose:\n");
            printf("1.显示通讯录\n");
            printf("2.添加成员\n");
            printf("3.删除成员\n");
            printf("4.退出\n");
}
void main()
{
    int choose;
    char c;
    do
    {
        if(read())
        {
            printmenu();
            scanf("%d",&choose);
            switch(choose)
            {
                case 1:print();break;
                case 2:insert();break;
                case 3:del();break;
                case 4:exit(0);
            }
        }
        else 
        {
            printf("没有通讯录，现在添加(y/n):");
            scanf("%c",&c);
            if(c=='y'||c=='Y')
                creat();
            else exit(0);       	
        }   
    }while(1);
}