Read number from text file without whitespace

Question

I am trying to read a 12 digit number from a text file in to an array. I have been able to do this successfully if I place whitespace between each digit. for instance:

1 1 1 1 1 1 1 1 1 1 1 1 

But when I remove the whitespace between the digits my program is no longer able to allocate the array from the text file. for instance:

111111111111

I am sure the answer is simple but I have been unable to find the solution to my exact problem anywhere. Below is my while loop that I use to allocate the array.

void int_class::allocate_array(std::ifstream& in, const char* file)
{
    //open file
    in.open(file);

    //read file in to array
    int i = 0;
    while( !in.eof())
    {
        in >> myarray[i];
        i++;
    }

    in.close();
}

Answer 1

To read an array of chars, supposing there are no spaces or other delimiters, you can read the whole of it from input stream at once:

in >> myarray;

To create an array of integers, you can read the input char by char and fill the array in place:

char c;
int i = 0;
while( !in.eof())
{
   in >> c;
   myarray[ i++ ] = c - '0';
}

In this case there may be any quantity of spaces in any place, they will be ignored.