(C++) std::cerr

std::cerr (abbreviation of 'character error stream') is a stream for error information.

`#include <iostream> int main() { std::cout << "Start of program\n"; std::cerr << "Error message: now in middle of program\n"; std::cout << "End of program\n"; }`

Screen output:

`Start of program End of program`

Qt Creator IDE output (while in debugging mode):

`Error message: now in middle of program Start of program End of program`