(C++) std::cerr

 

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

 

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#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:

 

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Start of program End of program

 

Qt Creator IDE output (while in debugging mode):

 

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