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ignore behaves as an UnformattedInputFunction. By pressing the “Enter” key after the first input, as the buffer of previous variable has space to hold new data, the program skips the following input of container. basicistream & ignore (std:: streamsize count 1, inttype delim Traits:: eof ()) Extracts and discards characters from the input stream until and including delim. So we need to clear the input buffer, otherwise it will occupy the buffer of previous variable. For example, after entering into the cin statement, we need to input a character array or string. Sometimes we need to clear the unwanted buffer, so when next input is taken, it stores into the desired container, but not in the buffer of previous variable. delimiter The element that, if encountered before count, causes ignore to return and allowing all elements after delimiter to be read. count The number of elements to skip from the current read position.

& ignore( streamsize count 1, inttype delimiter traitstype::eof()) Parameters.

Ignore file is associated with the file istream. To get the idea about ignore() is working, we have to see one problem, and its solution is found using the ignore() function. (this is possibly a duplicate of Why does std::basicistream::ignore() extract more characters than specified, however my specific case doesn't deal with the delim) From cppreference, the description of istream::ignore is the following: Extracts and discards characters from the input stream until and including delim. Ignore function is used to skip (discard/throw away) characters in the input stream.

cin.ignore(std::numericlimits::max(), ' ') In this form, it reads and discards the rest of the current line, and positions the stream at the beginning of the next line.

In your case, it instead encounters the, discards this, then returns without examining the stream further. In my experience, istream::ignore is usually used in the form. In case delimiter isnt at read position ignore(0,delimiter) do nothing and this is correct. The cin.ignore() function is used which is used to ignore or clear one or more characters from the input buffer. std::basicistream::ignore will only set eofbit if it encounters the end of the stream. basicistream::ignore(0,delimiter) extracts delimiter if it (delimiter) is at stream read position without regard to first parameter 0.