cin object fails to read double

cin returns fail on trying to read double value.
please help me find the bug.

Code:

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#include<iostream>
#include<array>
using namespace std;
const int MAX = 10;
void read_donations(array<double, MAX>& a, int& count);
int main()
{
        array<double, MAX> donations;
        int count;
        read_donations(donations, count);
        double sum = 0; int i;
        for (i = 0; i < count; ++i)
        {
                sum += donations[i];
        }
        double average = sum / count;
        cout << "average is " << average << endl;
        int larger=0;
        for (i = 0; i < count; i++)
        {
                if (donations[i]>average)
                        ++larger;
        }
        cout << larger << " elements are larger than the average.\n";
}
void read_donations(array<double, MAX>& a,int& count)
{
        int i = 0; count = 0;
        cout << "element 1: ";
        while ((i<a.size())&&!(cin >> a[i]))
        {
                ++i; ++count;
                cout << "element " << i + 1 << ": ";
        }
        if (count != MAX)
                cout << "read only upto " << count << " elements.\n";
        else
                cout << "all elements read.\n";
}

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in read_donations function,cin can't read the first element

I think

Code:

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while((i<a.size())&&!(cin >> a[i]))

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should be

Code:

---

while((i<a.size())&&(cin >> a[i]))

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thanks Aslaville.
it was a silly mistake

The i<a.size() part doesn't make sense to me. Should you be using MAX there instead of a.size()?

There doesn't seem to be a need for the i variable, you can drop it and just use count instead.