Incorrect output from windows 10 command prompt

Question

Where C++ compiler is Cygwin with gcc version 8.3.0

The following code

#include <iostream>

using namespace std;

int main() {
    cin.tie(0);
    ios_base::sync_with_stdio(0);

    cout << "START" << endl;

    int x;
    string a, b;
    getline(cin, a);
    cin >> x; cin.ignore();
    getline(cin, b);
    cout << a << endl;
    cout << b << endl;
    cout << x << endl;

    cout << "END" << endl;

from Windows 10 command prompt command :

g++ sol.cpp && a.exe < in.txt

and in.txt is a file:

Lorem Ipsum
5
Hello World

prints INCORRECT OUTPUT

START
Lorem Ipsum

5
END

instead of CORRECT OUTPUT

START
Lorem Ipsum
Hello World
5
END

while the same code in Cygwin terminal (bash) with command :

g++.exe sol.cpp && ./a.exe < in.txt

prints the correct output:

START
Lorem Ipsum
Hello World
5
END

What is possibly the problem here?

Answer 1

Thanks for the responses. The answer was solved. As @Johnny Mopp in the comments above pointed out, Windows uses \\r\\n ie carriage return and line feed respectively while Unix use \\n only, therefore in Windows one would need to write two cin.ignore() or cin.ignore(2, '\\n') while in Unix one cin.ignore() will suffice.