一个stack的例子

bl#include <iostream>
#include <stack>
#include <string>
using namespace std;

int main(){

    string s;
    stack<string>  st_str;

    while(cin>>s){
        st_str.push(s);
    }
    cin.clear();
    while(st_str.empty() == false){
        cout<<st_str.top()<<endl;
        st_str.pop();
    }
    cout<<"our program runs well"<<endl;
    return 0;
}