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C error expected specifier-qualifier-list before ‘time_t’

Answer 1

+4 A:

Have you #included <time.h>?

sth 2010-02-22 06:14:31

In time.h, you can get# include <bits/types.h> /* This defines __time_t for us. */

ambika 2010-02-22 06:27:56

@ambika: If that defines `__time_t` that doesn't mean it defines `time_t` as well. The error sounds like `time_t` is not defined. Why do you want to include some internal, implementation specific header?

sth 2010-02-22 06:47:20

Also: Are you sure you even include `bits/types.h`? Else it doesn't help if `time_t` is defined there.

sth 2010-02-22 06:56:24

Including `<time.h>` before including `"mas.h"` should do the trick, though if the OP can legitimately modify `mas.h`, it should be revised so that it can be used free-standing (it should include `<time.h>` itself to ensure that it compiles correctly).

Jonathan Leffler 2010-02-22 07:20:17

hi sth,thanks for your suggestion.i already include #include <sys/types.h>. then also i get error.

ambika 2010-02-22 07:38:24

`sys/types.h` is not the same as `bits/types.h` - and *more importantly*, you shouldn't include `bits/types.h`. If you want to use `time_t`, you have to include `time.h`. Simple.

Alok 2010-02-22 18:40:46

ambika: Just include time.h; it will include any system-specific files (bits/types.h or sys/types.h) that it needs.

John Bode 2010-02-22 21:17:37

Answer 2

A:

You need to include time.h before including mas.h.

qrdl 2010-02-22 06:49:14

No, if mas.h needs something from time.h, then mas.h should be including time.h itself.

Roger Pate 2010-02-24 00:02:59

@Roger I guess you don't know how C preprocessor works. It doesn't matter if `time.h` included from `mas.h` (somewhere before the first use of `time_t` type) or before `mas.h` - it will produce the same effect. However there is a school of though (which I'm not completely support) that headers shouldn't be included from headers, but only from main source.

qrdl 2010-02-24 03:02:15

Although you are correct, qrdl, that it doesn't matter how time.h is included as long as it is included, Roger is making a serious point. You should be able to include a header and have it work without any other dependencies - so it should be possible to include 'mas.h' without including anything else. And it should compile. See the NASA Goddard Space Flight Center (GSFC) coding standards for a discussion - there are numerous SO questions that cover the ground (including http://stackoverflow.com/questions/1804486/).

Jonathan Leffler 2010-03-11 05:18:09

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C error expected specifier-qualifier-list before ‘time_t’

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