Include all C headers for C89, C99, C11, C17, and C23 for programming contests and such

libc-bits.h

#ifndef LIBC_BITS_H
#define LIBC_BITS_H

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <float.h>
#include <limits.h>
#include <locale.h>
#include <math.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

/* c95+ */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199409L
#  include <iso646.h>
#  include <wchar.h>
#  include <wctype.h>
#endif

/* c99+ */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#  include <complex.h>
#  include <fenv.h>
#  include <inttypes.h>
#  include <stdbool.h>
#  include <stdint.h>
#  include <tgmath.h>
#endif

/* c11+ */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
#  include <stdalign.h>
#  include <stdatomic.h>
#  include <stdnoreturn.h>
#  include <threads.h>
#  include <uchar.h>
#endif

/* c23+ */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 201710L
#  ifdef __STDC_VERSION_STDBIT_H__
#    include <stdbit.h>
#  endif
#  ifdef __STDC_VERSION_STDCKDINT_H__
#    include <stdckdint.h>
#  endif
#endif

#endif