Using cin.get to get an integer

Question

I want to get a string of numbers one by one, so I\'m using a while loop with cin.get() as the function that gets my digits one by one.

But

Answer 1

cin.get can’t parse numbers. You could do it manually – but why bother re-implementing this function, since it already exists?^*

int number;
std::cin >> number;

In general, the stream operators (<< and >>) take care of formatted output and input, istream::get on the other hand extracts raw characters only.

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^* Of course, if you have to re-implement this functionality, there’s nothing for it.

To get the numeric value from a digit character, you can exploit that the character codes of the decimal digits 0–9 are consecutive. So the following function can covert them:

int parse_digit(char digit) {
    return digit - '0';
}