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What is the difference between cerr and cout streams in c++?
cout is an object of the stdout stream, while cerr is an object of the stderr stream.
stdout and stderr are different streams, even though they both refer to console output by default. Redirecting (piping) one of them (e.g. program.exe >out.txt) would not affect the other.
Generally, stdout ought to be used for actual program output, whereas all information and error messages should be printed to stderr, in order that if the user redirects output to a file, information messages are still printed on the screen and not to the output file.
Updated on: 30-Jul-2019
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