Effect of noskipws on cin>>

Question

As I understand, the extraction operator skips the whitespace in the beginning and stops upon encountering a whitespace or end of stream. noskipws can be used to stop ignori

Answer 1

The basic algorithm for >> of a string is:

skip whitespace
read and extract until next whitespace

If you use noskipws, then the first step is skipped. After the first read, you are positionned on a whitespace, so the next (and all following) reads will stop immediatly, extracting nothing.

>> to a string will never put whitespace into the string. More generally, using >> with noskipws is problematic, since whitespace is always a separator for >>; it may make sense to use it punctually, but it should generally be reset immediately after it has been used. (The once case where it might make sense is when using >> to a char. In this case, the stream always extracts one character.)