(C++) Reading digits from text file

Question

I have a text file which looks like this:

73167176531330624919225119674426574742355349194934 96983520312774506326239578318016984801869478851843 85

Answer 1

char digit;
std::ifstream file("digits.txt");
std::vector digits;
// if you want the ASCII value of the digit.
1- while(file >> digit) digits.push_back(digit);
// if you want the numeric value of the digit.
2- while(file >> digit) digits.push_back(digit - '0');