‘itoa’: The POSIX name for this item is deprecated

c++itoa

I'm trying to convert an int into a string by doing this:

int id = 12689;
char snum[MAX];
itoa(id, snum, 10);

I get the following error:

'itoa': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _itoa.

Best Solution

That is MSVC doing that to you. If you add the following line before any library #includes

#define _CRT_NONSTDC_NO_DEPRECATE

the warning is suppressed, similar for many other functions too.

Moreover if you add these two lines as well, MSVC will stop telling you to use scanf_s instead of the standard function scanf (and others).

#define _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_DEPRECATE

Related Solutions

Getch is deprecated

Microsoft decided to mark the name without underscore deprecated, because those names are reserved for the programmer to choose. Implementation specific extensions should use names starting with an underscore in the global namespace if they want to adhere to the C or C++ Standard - or they should mark themselves as a combined Standard compliant environment, such as POSIX/ANSI/ISO C, where such a function then corresponds to one of those Standards.

Read this answer about getcwd() too, for an explanation by P. J. Plauger, who knows stuff very well, of course.

If you are only interested to wait for some keys typed by the user, there really is no reason not to use getchar. But sometimes it's just more practical and convenient to the user to use _getch and friends. However, those are not specified by the C or C++ Standard and will thus limit the portability of your program. Keep that in mind.

How to define an enumerated type (enum) in C

It's worth pointing out that you don't need a typedef. You can just do it like the following

enum strategy { RANDOM, IMMEDIATE, SEARCH };
enum strategy my_strategy = IMMEDIATE;

It's a style question whether you prefer typedef. Without it, if you want to refer to the enumeration type, you need to use enum strategy. With it, you can just say strategy.

Both ways have their pro and cons. The one is more wordy, but keeps type identifiers into the tag-namespace where they won't conflict with ordinary identifiers (think of struct stat and the stat function: these don't conflict either), and where you immediately see that it's a type. The other is shorter, but brings type identifiers into the ordinary namespace.

Best Solution

Related Solutions

Getch is deprecated

How to define an enumerated type (enum) in C

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