How to completely clear the standard input stream in VS 2015?

Question

Programming

Can't clear input stream. In the 2013 version, the cin.sync() function worked for me. In the 2015 version, I can't understand how the standard input stream works at all.

cin >> a;
cin >> b;

If аboth bare strings, then with input data, for example, "уквкп пвапк", the аstring must appear "уквкп"in , and in b- "пвапк". In the line а, everything is as it should be, but in the line there bis only the end-of-line character. Explain someone.

Answer 1

In the 2015 version, I can't understand how the standard input stream works at all.

Decided to check:

#include <iostream>
#include <string>

int main()
{
  std::string a, b;
  std::cin >> a;
  std::cin >> b;
  std::cout << "a=" << a << " b=" << b << std::endl;
}

This code on VS Community 2015, when you type uwcp pwapk, it outputs a=uwcp b=pwapk . Everything is fine.
Requires a complete example with non-working code.