Questions tagged [c11]

C11 is the informal name of an older standard version (ISO/IEC 9899:2011) of the C programming language.

Important Note: All C related questions, shall be tagged as c, and then as a complement, each should specify the version of the standard it is using. In case of C11, this complement should be the c11 tag.

Detection

A standard macro __STDC_VERSION__ is defined with the value 201112L to indicate that C11 support is available. See corr 1:2012.

Some of the changes since c99:

_Alignas specifier (and optionally the alignas macro)
_Alignof operator (and optionally the alignof macro)
_Noreturn function specifier (and optionally the noreturn macro)
_Generic keyword
_Static_assert keyword (and optionally the static_assert macro)
_Thread_local storage-class specifier (and optionally the thread_local macro)
_Atomic type qualifier
_Complex and _Imaginary keywords (and optionally the complex and imaginary macros)
once_flag, cnd_t, mtx_t, thrd_t, thrd_start_t, tss_t and tss_dtor_t types
char16_t and char32_t types
anonymous struct and union support
aligned_alloc function
quick_exit function
gets_s function in much-rejected optional Annex K (see tr24731) as an alternative to the removed gets

More Info:

Wikipedia: C11 (C standard revision)
C11 Standard (Committee Draft, Document N1570)
Field Experience With Annex K - Bounds Checking Interfaces. Some insights about why Annex K was problematic to implement in practice.

875 questions

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fgets() chokes when encountering double forward slashes

I am using fgets() to parse a text file that contains hashed passwords (brypt). This hash contains a few characters additional to alphanumeric, but to my knowledge no special characters in C. My problem is that fgets() unexpectedly chokes when…

c++ c c11 c89

asked Aug 28 '23 at 08:59

user581894

-5

votes

1 answer

Is it legal to write ptr = &i; in C?

I have compiled following code on GCC using gcc prog.c -Wall -Wextra -pedantic -std=gnu11 command. It's does not generate any warning or error. Code: #include #include int main() { int i = 10; int *ptr = malloc(1); …

c pointers gcc malloc c11

asked Nov 07 '17 at 09:07

msc

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1 answer

Using secure print function in C

I'm a netbeans user, I'm trying to change printf with the secure printf_s function but it didn't work. the editor is not able to figure it out ? the same for scanf_s. I know it's a part of C11, everything is up to date. what's wrong ?

c compiler-errors c11

asked Oct 02 '14 at 23:12

Focus

-6

votes

1 answer

why this program compiles fine in C11 but not in C99?

Consider following program: (See live demo here) . #include struct Test { int a; }; typedef struct Test t; typedef struct Test t; int main() { t T={9}; printf("%d",T.a); } The program compiles fine in C11 compiler but fails in…

c struct typedef c99 c11

asked Oct 21 '15 at 14:16

Destructor

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Why C standards contain many unsafe functions, which are useless?

Why C standards contain many unsafe functions, which are useless (in good programs them don't use) and harmful, for example getchar? Why C standard doesn't contain instead of them the useful functions, for example getch, and getche? It is only one…

c c99 c89 c11

asked Dec 23 '12 at 16:47

Andrey Bushman

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