有兴趣的可以玩一玩:

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int a=0,b=100,c=0;
int main(){
	srand(time(NULL));
	int random_number=rand()%101;
	while(c==0){
		int n;
		cout<<a<<"到"<<b<<": ";
		cin>>n;
		if(n>=0&&n<=100&&n>=a&&n<=b){
			if(n<random_number){
				a=n;
			}else if(n>random_number){
				b=n;
			}else if(n==random_number){
				cout<<"游戏结束!"<<endl;
				c=1;
				break;
			}
		}else{
		    cout<<"数不在范围内!"<<endl;
			continue;
		}
	}
	return 0;
}