reading from stdin in c++

Question

I am trying to read from stdin using C++, using this code

#include 
using namespace std;

int main() {
    while(cin) {
        getline(cin,          


        

Answer 1

You have not defined the variable input_line.

Add this:

string input_line;

And add this include.

#include 

Here is the full example. I also removed the semi-colon after the while loop, and you should have getline inside the while to properly detect the end of the stream.

#include 
#include 

int main() {
    for (std::string line; std::getline(std::cin, line);) {
        std::cout << line << std::endl;
    }
    return 0;
}