Where Online Learning is simpler!

The C and C++ Include Header Files

cat -n /usr/include/x86_64-linux-gnu/bits/mathcalls-helper-functions.h

     1	/* Prototype declarations for math classification macros helpers.
     2	   Copyright (C) 2017-2026 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	/* Classify given number.  */
    20	__MATHDECL_ALIAS (int, __fpclassify,, (_Mdouble_ __value), fpclassify)
    21	     __attribute__ ((__const__));
    22	
    23	/* Test for negative number.  */
    24	__MATHDECL_ALIAS (int, __signbit,, (_Mdouble_ __value), signbit)
    25	     __attribute__ ((__const__));
    26	
    27	/* Return 0 if VALUE is finite or NaN, +1 if it
    28	   is +Infinity, -1 if it is -Infinity.  */
    29	__MATHDECL_ALIAS (int, __isinf,, (_Mdouble_ __value), isinf)
    30	  __attribute__ ((__const__));
    31	
    32	/* Return nonzero if VALUE is finite and not NaN.  Used by isfinite macro.  */
    33	__MATHDECL_ALIAS (int, __finite,, (_Mdouble_ __value), finite)
    34	  __attribute__ ((__const__));
    35	
    36	/* Return nonzero if VALUE is not a number.  */
    37	__MATHDECL_ALIAS (int, __isnan,, (_Mdouble_ __value), isnan)
    38	  __attribute__ ((__const__));
    39	
    40	/* Test equality.  */
    41	__MATHDECL_ALIAS (int, __iseqsig,, (_Mdouble_ __x, _Mdouble_ __y), iseqsig);
    42	
    43	/* Test for signaling NaN.  */
    44	__MATHDECL_ALIAS (int, __issignaling,, (_Mdouble_ __value), issignaling)
    45	     __attribute__ ((__const__));