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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/stdlib-float.h

$ cat -n /usr/include/x86_64-linux-gnu/bits/stdlib-float.h

     1	/* Floating-point inline functions for stdlib.h.
     2	   Copyright (C) 2012-2024 Free Software Foundation, Inc.
     3	   This file is part of the GNU C Library.
     4	
     5	   The GNU C Library is free software; you can redistribute it and/or
     6	   modify it under the terms of the GNU Lesser General Public
     7	   License as published by the Free Software Foundation; either
     8	   version 2.1 of the License, or (at your option) any later version.
     9	
    10	   The GNU C Library is distributed in the hope that it will be useful,
    11	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13	   Lesser General Public License for more details.
    14	
    15	   You should have received a copy of the GNU Lesser General Public
    16	   License along with the GNU C Library; if not, see
    17	   <https://www.gnu.org/licenses/>.  */
    18	
    19	#ifndef _STDLIB_H
    20	# error "Never use <bits/stdlib-float.h> directly; include <stdlib.h> instead."
    21	#endif
    22	
    23	#ifdef __USE_EXTERN_INLINES
    24	__extern_inline double
    25	__NTH (atof (const char *__nptr))
    26	{
    27	  return strtod (__nptr, (char **) NULL);
    28	}
    29	#endif /* Optimizing and Inlining.  */

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