Error Handling | C Programming Tutorial

Can we write this same program in a linux system

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Thanks, nice explanation

Great explanation - really turned the light on for me without overloading it with all the bells and whistles - thank you!

What about like strerror_s?

Thanks a lot ! I was trying to figure out how to do a log file for my programm and you answered almost all my questions !

Great explanation! Clear and concise, keep up the good work! ☺

It's best practice to save errno right after the function call. Many of the functions called in the example also set errno. The function fopen is easy because the return value tells you that you have an error. In many functions the return value says you might have an error and you need to check errno, e.g. strtol. In these cases you want to set errno to zero before the call.

How does errno know that what failed was file opening? I know you put "if (fh == NULL)" there, but how does it know that file opening failed and not something else? Who sets the errno value