程序代码：

#include <stdio.h>
#include <ctype.h>
#include <stdbool.h>
#include <time.h>
#include <stdlib.h>


int main (void)
{
    char xinyouxi ='Y';                    
    time_t seet =0,                     /*定义种子值*/
           now= 0,                       /*定义游戏时间*/
           now1=0;                       /*记录当前时间*/ 
    int shuzichuan =0;                    /*记录数字串的长度*/ 
    bool zhengque =true;                    /*确定游戏的正确性*/ 
    int cishu = 0;                          /*玩家游戏的次数*/ 
    int shuzi = 0;                      /*游戏玩家输入的数字*/       
           
    printf("这是一个猜数字的游戏！");
    printf("\n每答对三次，难度就会增加！\n");
    printf("按下回车键，进入游戏！\n");
    scanf("%c",&xinyouxi);
    
    do
    {
        zhengque = true ;
        shuzichuan = 2;
        now = clock();
        cishu = 0;
        
        while(zhengque)
        {
            shuzichuan += cishu++ % 3 == 0;          /*确定游戏长度，答对三次后游戏加一位数*/ 
            now1= clock();                    /*记录游戏开始时间*/
            seet= time(NULL);                /*记录当前时间种子值*/
            
            srand((unsigned int)seet);
            for(int i=0 ; i<shuzichuan ; i++)
            printf("%d ", rand() % 10);
            
            for( ; clock()-now1<CLOCKS_PER_SEC ; );
            printf("\r");
            for(int i=0 ; i<shuzichuan ; i++)
            printf("  ");
            
            if(cishu == 1)
            printf("\n请注意输入的格式，数字之间用空格间隔！\n");
            else
            printf("\r");
             
            srand((unsigned int)seet);
            for(int i=0 ; i<shuzichuan ; i++)
                scanf("%d",&shuzi);
                
                if(shuzi == rand() % 10)
                printf("正确！\n");
                else
                {
                    printf("错误！\n");
                    zhengque = false; 
                } 
                
        }
        
        now=(clock()-now)/CLOCKS_PER_SEC;
        printf("你用的时间是%d秒.\n",now);
        
        printf("你答对的次数是%d,成绩是%d\n。",cishu,cishu*10);
       
        printf("是否再玩一次？（y/n）:");
        scanf(" %c",&xinyouxi);        
        
        
    }while(toupper(xinyouxi) == 'Y');
    return 0;
}

程序代码：

if(shuzi == rand() % 10)
     printf("正确！\n");
else
{
     printf("错误！\n");
     zhengque = false; 
}