Reading integers from a text file with words

Question

I\'m trying to read just the integers from a text file structured like this....

ALS 46000
BZK 39850
CAR 38000
//....

using ifstream.

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Answer 1

You can call ignore to have in skip over a specified number of characters.

istr.ignore(4);

You can also tell it to stop at a delimiter. You would still need to know the maximum number of characters the leading string could be, but this would also work for shorter leading strings:

istr.ignore(10, ' ');

You could also write a loop that just reads characters until you see the first digit character:

char c;
while (istr.getchar(c) && !isdigit(c))
{
    // do nothing
}
if (istr && isdigit(c))
    istr.putback(c);