C语言：随机抽奖

Posted 2021-06-16 myrj

#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;
}