// vector.C
#include <iostream>
#include <vector>    // for std::vector
#include <iomanip>   // for std::setprecision, std::fixed
using namespace std;

int main()
{
    vector<int> numbers;   // born empty
    int x;

    cout << "Enter integers (non-integer or Ctrl+D to stop):\n";

    // Read until EOF or non-integer.
    while (cin >> x) {
        numbers.push_back(x);
    }

    cout << "\nYou entered " << numbers.size() << " number(s).\n";

    if (numbers.empty()) {
        cout << "No data to analyze.\n";
        return 0;
    }

    // Print the numbers.
    cout << "Numbers: ";
    for (size_t i = 0; i < numbers.size(); ++i) {
        cout << numbers[i] << (i + 1 == numbers.size() ? "" : " ");
    }
    cout << "\n";

    // Compute sum, min, max.
    long long sum = 0;
    int mn = numbers[0];
    int mx = numbers[0];

    for (size_t i = 0; i < numbers.size(); ++i) {
        sum += numbers[i];
        if (numbers[i] < mn) mn = numbers[i];
        if (numbers[i] > mx) mx = numbers[i];
    }

    double avg = static_cast<double>(sum) / numbers.size();

    cout << fixed << setprecision(2);
    cout << "Sum: " << sum << "\n";
    cout << "Average: " << avg << "\n";
    cout << "Minimum: " << mn << "\n";
    cout << "Maximum: " << mx << "\n";

    // Show how vector grows: add one more element.
    cout << "\nPushing back one more element: 42.\n";
    numbers.push_back(42);
    cout << "New size: " << numbers.size()
         << ", last element: " << numbers.back() << "\n";

    return 0;
}