24.定义一个整型变量，赋予1-100值。要求用户猜这个数，比较两数大小，把结果提示给用户，直到猜对为止

#include<iostream>
using namespace std;

int main()
{
    int a=50;
    int n;
    while(1)//关键，造成一个死循环
    {
        cout<<"please input an number: "<<endl;
        cin>>n;
        if(a==n)//循环退出条件
        {
            cout<<"n="<<n<<endl;
            break;
        }else if(a<n)
        {
            cout<<"your number are biger than the number,please try again."<<endl;
        }else if(a>n)
        {
            cout<<"your number are smaller than the number,please try again."<<endl;
        }
    }
    return 0;
}