C语言程序设计：通讯录程序设计

#include "stdlib.h"

#include "string.h"

#include "conio.h"

#include "stdio.h"

#include "dos.h"

FILE *fp

int i//i是全局变量 可代替length

struct address

{ char postnum[10]

char a[40]//家庭地址

}

struct birthday

{ int year

int month

int day

}

struct ffriend

{ int num//序号

char name[20]

char sex

char telephone[13]

struct birthday birthday

struct address address

}

friends[50]

void Load()

{

int j

long k

fp=fopen("friend.txt","a+")//打开文件friend.txt

if(fp!=NULL)

{

for(i=1i<50i++)

{

j=fgetc(fp)

if(j==EOF) //判断是否到了文件尾

return

k=i-1

fseek(fp,k*sizeof(struct ffriend),SEEK_SET)

fread(&friends[i],sizeof(struct ffriend),1,fp)//从文件中读取一条记录

}

}

else

{

fp=fopen("friend.txt","w")

i=1

}

}

void Show(int j)

{

// friends[j].num=i

printf("\n\n\t编号-Nnumber: %3d",friends[j].num)

printf("\n\t姓名-Name:%-20s",friends[j].name)

printf("\n\t性别-Sex:%c",friends[j].sex)

printf("\n\t联系电话-Telephone:%-13s",friends[j].telephone)

printf("\n\t出生日期-Birthday:%4d-%2d-%3d",friends[j].birthday.year,friends[j].birthday.month,friends[j].birthday.day)

printf("\n\t邮编-Postnum:%-10s",friends[j].address.postnum)

printf("\n\t通信地址-address:%-40s",friends[j].address.a)

}

void Append(int j)

{

fflush(stdin)//区内清除文件缓冲区，文件以写方式打开时将缓冲容写入文件

//stdin是一个标准FILE*（文件型指针）指向通常是用键盘的输入的输入流

friends[j].num=j

printf("\n\t\t\t序号-Number:%d",j)

printf("\n\t\t\t姓名-Name:")

scanf("%s",friends[j].name)

fflush(stdin)//为什么没有fflush(stdin)的效果会自动跳过呢?

printf("\t\t\t性别-Sex(m/w):")//为什么输入汉字男女也会自动跳过联系电话呢

scanf("%c",&friends[j].sex)

printf("\t\t\t联系电话-telephone:")

scanf("%s",friends[j].telephone)

printf("\t出生日期-birthday")

printf("\n\t\t\t年份-year:")

scanf("%d",&friends[j].birthday.year)

printf("\t\t\t月份-month:")

scanf("%d",&friends[j].birthday.month)

printf("\t\t\t日-day:")

scanf("%d",&friends[j].birthday.day)

printf("\t\t\t邮编-Postnumber:")

scanf("%s",friends[j].address.postnum)

printf("\t\t\t通信地址-Address:")

scanf("%s",friends[j].address.a)

getchar()

}

void Delete()

{

int k

printf("\n\tDelete 序号-Number:")

scanf("%d",&k)

if(k<=i)

{

for(int j=kj<i+1j++) /*插入位置后的元素顺序后移*/

{

strcpy(friends[j].name,friends[j+1].name)/*交换元素内容*/

friends[j].sex=friends[j+1].sex

strcpy(friends[j].telephone,friends[j+1].telephone)

friends[j].birthday.year=friends[j+1].birthday.year

friends[j].birthday.month=friends[j+1].birthday.month

friends[j].birthday.day=friends[j+1].birthday.day

strcpy(friends[j].address.postnum,friends[j+1].address.postnum)

strcpy(friends[j].address.a,friends[j+1].address.a)

}

i--

}

else

{

printf("输入的序号太大!")

}

}

void Modify(int j)

{

Append(j)

}

void Save()

{

int j

fp=fopen("friend.txt","w")

for(j=1j<=ij++)

{

fwrite(&friends[j],sizeof(struct ffriend),1,fp)

}

fclose(fp)

}

void main()

{

int j

char grade

char searchname[10]

Load()

i--

do

{

printf("\t\t\t\t简易通讯录\n\n")

printf("功能选择(Function choose)\n")

printf("\1A.读取(Read)\n")

printf("\2B.增添(Append)\n")

printf("\6C.插入(Insert)\n")

printf("\5D.删除(Delete)\n")

printf("\5E.查询(Search)\n")

printf("\6F.修改(Modify)\n")

printf("\2G.保存(Save)\n")

printf("\1H.退出(Quit)\n")

printf("请选择(Choice)\n注:输入A~H的大写字母\n")

scanf("%c",&grade)

switch(grade)

//加个大写和小写 都可以啊

{

case 'A': j=1//显示功能

while(getchar()!=0x1b&&j<=i) //增添按Esc键退出

{

Show(j++)

printf("\n请按回车键继续!")

}

if(j-1<1)

{

printf("\n\t空文档,无任何记录-Empty Note\n")

printf("\n请按回车键继续!")

getchar()

}

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

break

case 'B': //增加功能

while(i<=50) //增加按ESC键退出的功能

{

i++

Append(i)

printf("\t是否继续增加?y/n")

//修改 加上else if 其他就跳出或强制打印出出错

char a=getchar()

if(a=='n'||a=='N')

break

}

if(i==51)

printf("\n\t文档已满,无法增加记录-note full")

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

getchar()

break

case 'C':

int k

printf("\n\t输入要插入的位置:")

scanf("%d",&k)

j=i+1

friends[j].num=j

for(jj>kj--) //插入功能

{

strcpy(friends[j].name,friends[j-1].name)//数据后移

friends[j].sex=friends[j-1].sex

strcpy(friends[j].telephone,friends[j-1].telephone)

friends[j].birthday.year=friends[j-1].birthday.year

friends[j].birthday.month=friends[j-1].birthday.month

friends[j].birthday.day=friends[j-1].birthday.day

strcpy(friends[j].address.postnum,friends[j-1].address.postnum)

strcpy(friends[j].address.a,friends[j-1].address.a)

}

Append(k)

i++

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

break

case 'D': //删除功能 //增添随意删除多条记录的功能

Delete()

if(i<1)

printf("\n没有记录-No records\n")

printf("\n请按回车键继续!")

getchar()

getchar()

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

break

case 'E': //查询功能

printf("\n\t请输入要查询记录的相关姓名:")//增添查询按列号的

scanf("%s",searchname)

for(j=1j<=ij++)

{

if(strcmp(searchname,friends[j].name)==0) //比较字符串

{

Show(j)

break

}

}

if(i<1)

{

printf("\n 没有您所查询的记录-No records")

printf("\n 请按回车键继续!")

getchar()

}

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

getchar()

break

case 'F': //修改功能 / /增添按序列号查询

printf("\n\t请输入要修改记录的相关姓名:")

gets(searchname)

scanf("%s",searchname)

for(j=1j<=ij++)

{

if(strcmp(searchname,friends[j].name)==0) //比较字符串

{

Modify(j)

// getchar()//加个输出确定修改吗

}

}

if(i<1) //修改功能

{ printf("\n 没有您所要修改的记录-No records")

printf("\n 请按回车键继续!")

getchar()

getchar()

}

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

break

case 'G':

Save()//存盘功能

getchar()

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

break

case 'H': //退出功能

char x

printf("是否保存?yes/no\n")

scanf("%s",&x)

//getchar()

// getchar()

if(x=='y')

{

Save()

exit(0)

}

else

exit(0)

default:

printf("\n\t输入有误,请输入正确的序列号!")

printf("\n请按回车键继续!")

getchar()

printf("\n\t\t\t\t\t\t\t此次 *** 作结束")

printf("\n\t------------------------------------------------------------\t\t\n")

}

}while(1)

}

一个利用pipe，进行父子进程间通信的小例子

#include <stdio.h>

#include <unistd.h>

#include <sys/wait.h>

#include <stdlib.h>

int main(void)

{

int fds[2]

pid_t pid

if(pipe(fds) == -1)

{

perror("pipe error")

exit(1)

}

pid=fork()

if(pid == -1)

{

perror("fork error")

exit(1)

}

if(pid == 0)//parent

{

char buf[1024]

int n

close(fds[1])

n = read(fds[0], buf, 1024)//从管道读端读出数据到buf

write(STDOUT_FILENO, "child:",6)

write(STDOUT_FILENO, buf, n)//将读到的数据打印到终端

}

else//child

{

close(fds[0])

write(fds[1], "hello world\n", 12)//向管道写端写入数据“hello world\n”

wait(NULL)

}

return 0

}

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