c++ primer plus 第六章《编程题6.11.2》

/*
 Enter up to 10 donation values.
 The 1 donation values: 12
 The 2 donation values: 10
 The 3 donation values: 8
 The 4 donation values: 6
 The 5 donation values: 4
 The 6 donation values: 2
 The 7 donation values: y
 The average: 7
 Have 3 values over the average.
*/
#include <iostream>
#include <array>

using namespace std;

int main() {

    int i;
    double sum = 0;
    double average = 0;
    int count = 0;
    array<double, 10> digit;
    cout << "Enter up to 10 donation values.\n";

    for (i = 0; i < 10; i++) {
        cout << "The " << i + 1 << " " << "donation values: ";
        if (!(cin >> digit[i]))
            break;
        sum += digit[i];
        cin.get();
    }
    if (i == 0) {
        cout << "Erro, your enter isn't a donation value. the program will be terminate.";
        exit(-1);
    }
    average = sum / i;
    for (auto i : digit)
        if (i > average)
            count++;

    cout << "The average: " << average << "\n";
    cout << "Have " << count << " values " << "over the average.\n";

    return 0;
}