Skipping right over getline

[binarybob0001]

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream>
#include <cstdlib>

using namespace std;

bool yes()
{
  string ans;
  while (true)
  {
	cin >> ans;
	if ( (ans == "Y") || (ans == "y") )
	  return true;
	if ( ans == "N" || ans == "n" )
	  return false;
	if (ans == "Q" || ans == "q" )
	  exit(0);
	cout << "Invalid option" << endl;
  }
}


int main(int argc, char *argv[])
{
  string file;
  file = "Hello, world";
  cout << "Rename file to: " << file << endl;
  if (!yes())
	 getline(cin, file);
  cout << file;

  return EXIT_SUCCESS;
}

The output for this looks like this:
Rename file to: Hello, world
n
Press Enter to continue!
For some reason it skips right over getline. Any idea of why this is happening?

[Philip Nicoletti]

Mixing operator >> and getline() is a bit tricky. In yes() ypu do a

cin >> ans;

This stops reading from the stream when it sees a whitespace in
the stream. The important point is that the position of the stream
is just before that whitespace (in your case the whitespace will be '\n').

Next in main you do a

getline(cin, file);

This starts reading at the current stream position until it reaches a '\n'.
However the current stream position is a '\n'.

One way to get around this is to throw out everything in the stream
after doing the operator >>

  if (!yes())
  {
    // skip until end-of-line
     cin.ignore(std::numeric_limits<int>::max(),'\n');  // include <limits>

     getline(cin, file);
  }

(also, in your code you forgot to include <string>)