«

Debanjan wrote:
> Does there exist any other alternative data structure instead of
> struct tm (having same memory allocated as this structure) ? So that I
> could use strftime without declaring <time.h>
>
> I am aware of the fact that relying on implicit declaration is not
> good,but I faced this question in an interview.
>
> To be precise I was asked to print the month for a corresponding
> integer using standard library function,but not allowed to include any
> header file.

That's about as bad as being asked to complete a driving test without
using a car.

You can't safely use any standard library functions without including
the headers that declare them and their data structures.

--
Ian Collins

Ian Collins <ian-> writes:

> You can't safely use any standard library functions without including
> the headers that declare them and their data structures.

I don't recommend doing it, but some standard library functions
may legitimately be used without including the appropriate
standard header:

7.1.4 Use of library functions
....
2 Provided that a library function can be declared without
reference to any type defined in a header, it is also
permissible to declare the function and use it without
including its associated header.
--
"...what folly I commit, I dedicate to you."
--William Shakespeare, _Troilus and Cressida_

Ben Pfaff wrote:
> Ian Collins <ian-> writes:
>
>> You can't safely use any standard library functions without including
>> the headers that declare them and their data structures.
>
> I don't recommend doing it, but some standard library functions
> may legitimately be used without including the appropriate
> standard header:
>
> 7.1.4 Use of library functions
> ....
> 2 Provided that a library function can be declared without
> reference to any type defined in a header, it is also
> permissible to declare the function and use it without
> including its associated header.

That's why I added "and their data structures"!

In the OP's context, struct tm is a classic case of a structure defined
(by the standard) to include minimum set of members. An implementation
is free to add some of its own.

--
Ian Collins

Ian Collins <ian-> writes:

> Ben Pfaff wrote:
>> Ian Collins <ian-> writes:
>>
>>> You can't safely use any standard library functions without including
>>> the headers that declare them and their data structures.
>>
>> I don't recommend doing it, but some standard library functions
>> may legitimately be used without including the appropriate
>> standard header:
>>
>> 7.1.4 Use of library functions
>> ....
>> 2 Provided that a library function can be declared without
>> reference to any type defined in a header, it is also
>> permissible to declare the function and use it without
>> including its associated header.
>
> That's why I added "and their data structures"!

I can use exit() by declaring it myself, without including
<stdlib.h>, but your statement (quoted above) says that I can't.
So your statement is wrong.
--
"IMO, Perl is an excellent language to break your teeth on"
--Micah Cowan