不知道算不算小游戏，感觉还挺有意思的

***涉及到了随机数的产生，以系统时间为种子产生随机数

#include <iostream>
#include <ctime>
using namespace std;

int main()
{   srand((unsigned int)time(NULL));
   int num=(rand()%100)-1;
   int cai=0;
   while(1)
    {cout<<"please input your guess"<<endl;
        cin>>cai;
        if(cai>num)
          {
              cout<<"too high!try again"<<endl;
              continue;
          }
        else if(cai<num)
          {
              cout<<"too low!try again"<<endl;
              continue;
          }
        else
          cout<<"excellent!you guessed the number!"<<endl;break;
    }
    return 0;
}