二分查找--找数字

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main(int argc, char** argv) {
    int x; 
    srand(time(0));
    do{
    int num=rand()%100;
    cout<<"请输入一个数字，我看康康对不对，当前是第"<<x<<"次"<<endl; 
    int a;
    cin>>a;
    if(a==num){
        cout<<"相等"<<endl; 
        break;
    }else if(a>num){
        cout<<"大了"; 
    }else{
        cout<<"小了";
    }
    x++;
 }while(true);
 cout<<"你真棒，只用了"<<x<<"次"<<endl;
    return 0;
}