Why this
#include <math.h>
#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;

int main()
{
    vector<double> numbers;
    double number = 0;
    while(cin >> number){
        numbers.push_back(number);
    }

    for(int i = numbers.size() - 1; i >= 0 ; i--){
        cout<<setprecision(5)<<sqrt(numbers[i])<<'\n';
    }

    return 0;
}

is wrong and this

//...
printf("%.4lf\n", sqrt(numbers[i]));
//...

is write? I don't understand. Both ways are correct...

I don't know C++ a lot, but I think setprecision(5) means at most 5 digits. So use this instead and be happy:
cout<<setprecision(5)<<setiosflags(ios::fixed)<<sqrt(numbers[i])<<'\n';
in which setiosflags(ios::fixed) means there must be 5 digits, filling with zero, which will satisfy the judge.

Edited by author 04.01.2010 18:41

Edited by author 04.01.2010 18:42