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There's no general way to know which library is required to use a particular function. You need to look at the documentation of that library. A well-written tutorial or API reference should tell you, that's its job. You can at least get an idea of what library package is required: it's the same library package that contains the header file. How to determine ...


return value I see that you're using EXIT_FAILURE in your code, therefore you're including stdlib.h. In that header file EXIT_FAILURE and EXIT_SUCCESS are defined as: #define EXIT_FAILURE 1 /* Failing exit status. */ #define EXIT_SUCCESS 0 /* Successful exit status. */ Which is in accordance with typical behaviour of UNIX programs. ...


From help type in a bash shell: type: type [-afptP] name [name ...] Display information about command type. For each NAME, indicate how it would be interpreted if used as a command name. ... Exit Status: Returns success if all of the NAMEs are found; fails if any are not found.

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