Using ifstream variable in while loop condition

[Return 0]

I have the following code:

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	const int ARRAY_SIZE = 100;
	int numbers[ARRAY_SIZE];
	int count = 0;
	ifstream inputFile;

	inputFile.open("numbers.txt");

	while ( count < ARRAY_SIZE && inputFile >> numbers[count] )
		count++;

	inputFile.close();
	return 0;
}

I don't understand exactly what inputFile >> numbers[count] is doing. I understand its reading in the numbers from the file and assigning them to each element in the array, but I don't really understand what its doing in the condition list. If ARRAY_SIZE is the maximum iteration of the loop, what's the purpose of the inputFile condition? Any help will be greatly appreciated.

Thanks,
Return 0;

[Bazzy]

Because that checks whether the number has been successfully read from the stream

eg: if the file was like this:

1 2 3 4 5 6 not_a_number 7 8 9 ...

the numbers are read until "not_a_number" is reached, after that error the loop is terminated

[Return 0]

Ah I see, that makes sense. Thank you.