#include <stdio.h>

#include <stdlib.h> //<stdlib.h>用于调用 rand()，

#include <time.h> //声明time 时间不可逆转一直在变

 #include <Windows.h>  //<Windows.h> 用于清屏

#include <conio.h>  //<conio.h>  用按键用的

#define MAX_NUM 9999

int main()

{

 FILE *fp = fopen("data.txt", "rb");

    char numa[20];

    while(!feof(fp))

   {

       fscanf(fp,"%d",&numa);

       printf("%d ",numa);

   }

   fclose(fp);

int num;

srand((unsigned)time(0)); //rand是伪随机，所以先弄srand，才能是真的随机数

    while (1)

    {

        if (!_kbhit())

    { num = rand()%(999-100+1)+100; //rand()用法:rand()%(上限-下限+1)+下限

    printf("抽奖中....%d\n",num);

    Sleep(10);              //以毫秒计时

    system("cls");    }                           //system("cls")作用:清屏

    else break;

    }

    printf("抽奖结果是:%d\n",num);

    return 0;

}

#include <stdio.h>

#include <stdlib.h> //<stdlib.h>用于调用 rand()，

#include <time.h> //声明time 时间不可逆转一直在变

 #include <Windows.h>  //<Windows.h> 用于清屏

#include <conio.h>  //<conio.h>  用按键用的

#define MAX_NUM 9999

int main()

{

    clock_t start,stop;

    typedef struct

{

    int ida;

    char name[20];

}student;

    student st[MAX_NUM];

 FILE *fp = fopen("data1.txt", "rb");

    char numa[20];

    int aa=0;

    while(!feof(fp))

   {

       fscanf(fp,"%s",st[aa].name);

       st[aa].ida=aa;

       printf("%s %d\n",st[aa].name,st[aa].ida);

       aa++;

       Sleep(10);

   }

   aa=aa-2;

   Sleep(4000);

   fclose(fp);

int num;

srand((unsigned)time(0)); //rand是伪随机，所以先弄srand，才能是真的随机数

start=clock();

    while (1)

    {

        stop=clock();

        printf("\n%d\n",stop-start);

        if (stop-start>5000)

           break;

        if (!_kbhit())

        { num = rand()%(aa-0+1)+0; //rand()用法:rand()%(上限-下限+1)+下限

        printf("抽奖中....%s,%d\n",st[num].name,st[num].ida);

        Sleep(10);              //以毫秒计时

        //system("cls");

         }                           //system("cls")作用:清屏

        else break;

        }

    printf("抽奖结果是:%s,%d\n",st[num].name,st[num].ida);

    return 0;

}