这是一道很水的题，有人会看题解吗？
CO
/*
PROGRAM: $PROGRAM
AUTHOR: Su Jiao
DATE: 2010-3-8
DESCRIPTION:
$DESCRIPTION
*/
#include <iostream>
using std::cin;
using std::cout;
using std::endl;
#include <cstring>
using std::memset;
#include <stack>
using std::stack;
#include <cmath>
using std::sqrt;
#include <iomanip>
using std::setiosflags;
using std::setprecision;
class Application
{
stack<long long int> A;
public:
Application()
{
long long int input;
while (cin>>input)
A.push(input);
}
int run()
{
long long int pop;
cout<<setiosflags(std::ios::fixed)<<setprecision(4);
while (!A.empty())
{
pop=A.top();
A.pop();
cout<<sqrt(double(pop))<<endl;
}
return 0;
}
};
int main()
{
Application app;
return app.run();
}