You have not defined the variable input_line
.
Add this:
string input_line;
And add this include.
#include <string>
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 <iostream> #include <string> int main() { for (std::string line; std::getline(std::cin, line);) { std::cout << line << std::endl; } return 0; }
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