Can anyone please tell me what are the usage differences between std::cerr and perror
void perror ( const char * str );
I wonder which one is preferable in C++ applications and why it's preferable.
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Kiril Kirov
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F. Aydemir
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possible duplicate of [C++ alternative to perror()](http://stackoverflow.com/questions/3320898/c-alternative-to-perror) – Andreas Fester Mar 22 '13 at 09:55
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http://www.cplusplus.com/reference/cstdio/perror/
perror and cerr are different things. cerr - is object of std::ostream class connected with stderr. And perror prints errno and your string in stderr.
ForEveR
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Your question basically boils down to iostream vs stdio. A similar question has been answered here.
If you're working in C++ cerr is definitely preferable to perror unless you want to do something very specific. The only real difference is that cerr is virtually the same as
fprintf(stderr, const char*, arg1, ...);
while perror will also load and display the appropriate error message depending on errno. Also you can't display variables with perror so you can't do
perror("Something went wrong, i: %d", i);
unless you preprocess your error message.
