c++ check input read from file with fail

I am writing a simple program to read a series of integers from file and output their sum. I am to make sure that the input is indeed an integer, and exit the program if it isn't. I think I am doing everything right, but the program won't break when it is given invalid input. I am testing this with a file containing: 1 2 3 4 5 6 7 8 bla 9 Is there something I am not seeing here?

Thanks

#include <iostream>
#include <Fstream>

using namespace std;

int main(int argc, char const *argv[])
{
     ifstream dataFile;
     int number, total = 0;

     if (argc < 2) { cout << "You forgot to specify the file name." << endl; exit(-1);}

    dataFile.open(argv[1]);

    while (dataFile>>number){
        if(dataFile.fail()) {cout<< "Found a not number"<<endl; exit(-2);}
        else total += number;
    }

    cout << total << endl;
    dataFile.close();
    return 0;

}