source: trunk/libs/newlib/src/newlib/libm/mathfp/s_log10.c @ 471

Last change on this file since 471 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 1.0 KB
Line 
1
2/* @(#)z_log10.c 1.0 98/08/13 */
3/******************************************************************
4 * Logarithm
5 *
6 * Input:
7 *   x - floating point value
8 *
9 * Output:
10 *   logarithm of x
11 *
12 * Description:
13 *   This routine returns the logarithm of x (base 10).
14 *
15 *****************************************************************/
16
17/*
18FUNCTION
19        <<log10>>, <<log10f>>---base 10 logarithms
20
21INDEX
22log10
23INDEX
24log10f
25
26SYNOPSIS
27        #include <math.h>
28        double log10(double <[x]>);
29        float log10f(float <[x]>);
30
31DESCRIPTION
32<<log10>> returns the base 10 logarithm of <[x]>.
33It is implemented as <<log(<[x]>) / log(10)>>.
34
35<<log10f>> is identical, save that it takes and returns <<float>> values.
36
37RETURNS
38<<log10>> and <<log10f>> return the calculated value.
39
40See the description of <<log>> for information on errors.
41
42PORTABILITY
43<<log10>> is ANSI C.  <<log10f>> is an extension.
44
45*/
46
47
48#include "fdlibm.h"
49#include "zmath.h"
50
51#ifndef _DOUBLE_IS_32BITS
52
53double
54log10 (double x)
55{
56  return (logarithm (x, 1));
57}
58
59#endif /* _DOUBLE_IS_32BITS */
Note: See TracBrowser for help on using the repository browser.