adduser.c

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/* 添加用户 */
#include "stdio.h"
#include "user.h"
void AddUser()
{
    FILE *fp=NULL;
    user Show;
    user TempS;
    char DataFile[10]="yonghu";/* 存储用户信息文件名 */
    int count=1;
    fp=fopen(DataFile,"ab+");/* a+,当文件存在时，追加，当件不存在时，创建 */
    clrscr();
    if(fp==NULL)
    {
     printf("\nOpen file %s fail! End with any key.\n",DataFile);
     perror("Open file fail");
     getch();
     exit(1);
    }
    /* 如果成功打开文件，则提示输入用户相关信息 */
    printf("input number,name,password and grade,number is 0 means input is end.\n");
    printf("Number is not exceed 9 figures,Name is not exceed 20 characters ,range of grade:0~1");
    /* 循环从键盘上读取用户输入的用户相关信息 */
    while(1)
    {
     printf("\nInput 'number=0' means end input.\n");
     printf("number=");
     scanf("%ld",&TempS.Number);
     if(TempS.Number==0)
        break;
     printf("name:");
     scanf("%s",&TempS.Name);
     TempS.Name[19]='\0';

     printf("password:");
     scanf("%s",&TempS.ps);
     TempS.ps[7]='\0';

     printf("grade:");
     scanf("%d",&TempS.power);

     printf("\n");
     /* 如遇无法写入文件的异常，则加以提示 */
     if(fwrite(&TempS,sizeof(user),1,fp)!=1)
     {
        printf("\nwrite file %s fail! End with any key\n",DataFile);
        perror("write file fail");
        getch();
        exit(1);
     }
     count++;
    }
    fclose(fp);
    /* 在屏幕上显示增加操作后的文件内容 */
    printf("The data you input is store successful %s in file.\n",DataFile);
    printf("Content as follow:\n");

    fp=fopen(DataFile,"rb");
    if(fp==NULL)
    {
     printf("\nOpen file %s fail! End with any key\n",DataFile);
     perror("Open file fail");
     getch();
     exit(1);
    }
    printf("\nNumber\t\tName\t\tpassword\t\tpower\n");
    while(fread(&Show,sizeof(user),1,fp)!=(int)NULL)
    {
     printf("\n%ld\t\t%s\t\t%-8s\t\t%d\n",Show.Number,Show.Name,Show.ps,Show.power);
    }
    fclose(fp);
    printf("press any key to continu...");
    getch();
}