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I tried researching the difference between cout, cerr and clog on the internet but couldn't find a perfect answer. I still am not clear on when to use which. Can anyone explain to me, through simple programs and illustrate a perfect situation on when to use which one?
I visited this site which shows a small program on cerr and clog, but the output obtained over there can also be obtained using cout. So, I'm confused over each one's exact use.
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cerr and clog both are associated with the standard C error output stream stderr but the cerr is the unbuffered standard error stream whereas the clog is the buffered standard error stream.
The cerr object in C++ is used to print error messages. It is defined in the iostream header file.
std::clog. extern ostream clog; Standard output stream for logging. Object of class ostream that represents the standard logging stream oriented to narrow characters (of type char ). It corresponds, along with cerr , to the C stream stderr .
Explanation: cerr is an object of class ostream that represents the standard error stream. It is associated with the cstdio stream stderr.
Generally you use std::cout for normal output, std::cerr for errors, and std::clog for "logging" (which can mean whatever you want it to mean).
The major difference is that std::cerr is not buffered like the other two.
In relation to the old C stdout and stderr, std::cout corresponds to stdout, while std::cerr and std::clog both corresponds to stderr (except that std::clog is buffered).
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