1 /* 2 * Copyright (c) 1994-2009 Red Hat, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * 3. Neither the name of the copyright holder nor the names of its 16 * contributors may be used to endorse or promote products derived from this 17 * software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 FUNCTION 34 <<abs>>---integer absolute value (magnitude) 35 36 INDEX 37 abs 38 39 ANSI_SYNOPSIS 40 #include <stdlib.h> 41 int abs(int <[i]>); 42 43 TRAD_SYNOPSIS 44 #include <stdlib.h> 45 int abs(<[i]>) 46 int <[i]>; 47 48 DESCRIPTION 49 <<abs>> returns 50 @tex 51 $|x|$, 52 @end tex 53 the absolute value of <[i]> (also called the magnitude 54 of <[i]>). That is, if <[i]> is negative, the result is the opposite 55 of <[i]>, but if <[i]> is nonnegative the result is <[i]>. 56 57 The similar function <<labs>> uses and returns <<long>> rather than <<int>> values. 58 59 RETURNS 60 The result is a nonnegative integer. 61 62 PORTABILITY 63 <<abs>> is ANSI. 64 65 No supporting OS subroutines are required. 66 */ 67 68 #include "_ansi.h" 69 #include <stdlib.h> 70 71 int 72 _DEFUN (abs, (i), int i) 73 { 74 return (i < 0) ? -i : i; 75 } 76