c++ print to standard error

To print to standard error in C++, you can use the "cerr" object, which is an instance of the "ostream" class. Here's an example:

#include <iostream>

int main() {
  std::cerr << "This is an error message" << std::endl;
  return 0;
}

In this example, we include the header file to gain access to the input and output stream classes. Inside the main function, we use "std::cerr" to send the error message "This is an error message" to the standard error output. Finally, we use "std::endl" to end the line and return 0 to indicate successful execution.