Using `getline(cin, s);` after using `cin >> n;`

Question

int n;
std::cin >> n;

std::string s = "";
std::getline(cin, s);

I noticed that if I use cin, my program would hang the next time I reach the line getline(cin, rangeInput).

Since getline() is using cin, is that why it is causing the program to hang if I have previously used cin? What should I do if I want to get a line after using cin?

Answer 1

You need to clear the input stream - try adding the following after your cin:

cin.clear();
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

The accepted answer to this question gives a good explanation of why/when this is required.