Thread: itoa undeclared?

stdlib.h is C standard, therefore can't be deprecated.
C++ standard defines other practices.

To quote the standard:

Annex D
[...]
2 These are deprecated features, where deprecated is defined as: Normative for the current edition of the Standard, but not guaranteed to be part of the Standard in future revisions.
[...]
D.5 Standard C library headers [depr.c.headers]
1 For compatibility with the Standard C library, the C + + Standard library provides the 18 C headers, as shown in Table 100:
[...]
2 Every C header, each of which has a name of the form name.h, behaves as if each name placed in the Standard library namespace by the corresponding cname header is also placed within the namespace scope of the namespace std and is followed by an explicit using-declaration (7.3.3).