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Unable to return NULL in a function that expects an integer return type

If the return type is int, you can't return a NULL. To show an error, you could instead return a special value like zero or -1, if you check for that value in any calling function. Lots of functions return nonnegative numbers on success, or -1 on error.

NULL cannot be stored in an int variable, unlike in SQL, for example. If you ignore the warning and return NULL anyway, then NULL will be casted to zero. The calling function won't be able to tell whether you returned NULL or zero.

If your function only needs to indicate success or failure, then it's common to return 1 for success, and zero for failure. Zero means "false" when treated as a boolean value (like in if statements), and non-zero means "true."

Categories : C

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What does return; in a C function of boolean return type return?
This is undefined behavior, a return statement without an expression shall only be used in a function whose return type is void. This is covered in the draft C99 standard section The return statement: [...]A return statement without an expression shall only appear in a function whose return type is void. Interestingly this is an error by default when using clang but gcc without any

Categories : C
Compare values of return type Boolean and Integer
There's a shorter way to write it: Instead of: if (BServer.y.equals(new Integer(1))) { return true; } else { return false; } write : return (BServer.y == 1) ? true : false;

Categories : Java
Unable to return List object
You are not adding the results from recursive calls. So ideally you are getting the results from only the last directory which may not have some files.. Try this: foreach (DirectoryInfo SubdirInfo in DirInfo.GetDirectories()) { FileInfoList.AddRange(SearchFileSystem(SubdirInfo, FileList)); }

Categories : C#
Unable to return string forms of DateField and TimeField field values
As mentioned in the comment, looks like the console session still remembered the previous code even though the actual code has been changed. I just had to restart the shell again to see the changes.

Categories : Python
Return value for parent function (nested); Waiting for asynchronous function
You might find it more useful to write a constructor that returns a "promisified Image", ie an instance of window.Image with a custom .setSrc() method that returns a promise. Something like this (untested) should do it : function PromisifiedImg() { var img = new Image(); img.setSrc = function(src, limits) { var dfrd = $.Deferred(); img.onload = function() { i

Categories : Jquery
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