Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.0 KB
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1 | |
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2 | /* @(#)z_log10.c 1.0 98/08/13 */ |
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3 | /****************************************************************** |
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4 | * Logarithm |
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5 | * |
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6 | * Input: |
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7 | * x - floating point value |
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8 | * |
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9 | * Output: |
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10 | * logarithm of x |
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11 | * |
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12 | * Description: |
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13 | * This routine returns the logarithm of x (base 10). |
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14 | * |
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15 | *****************************************************************/ |
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16 | |
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17 | /* |
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18 | FUNCTION |
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19 | <<log10>>, <<log10f>>---base 10 logarithms |
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20 | |
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21 | INDEX |
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22 | log10 |
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23 | INDEX |
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24 | log10f |
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25 | |
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26 | SYNOPSIS |
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27 | #include <math.h> |
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28 | double log10(double <[x]>); |
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29 | float log10f(float <[x]>); |
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30 | |
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31 | DESCRIPTION |
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32 | <<log10>> returns the base 10 logarithm of <[x]>. |
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33 | It is implemented as <<log(<[x]>) / log(10)>>. |
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34 | |
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35 | <<log10f>> is identical, save that it takes and returns <<float>> values. |
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36 | |
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37 | RETURNS |
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38 | <<log10>> and <<log10f>> return the calculated value. |
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39 | |
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40 | See the description of <<log>> for information on errors. |
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41 | |
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42 | PORTABILITY |
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43 | <<log10>> is ANSI C. <<log10f>> is an extension. |
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44 | |
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45 | */ |
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46 | |
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47 | |
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48 | #include "fdlibm.h" |
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49 | #include "zmath.h" |
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50 | |
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51 | #ifndef _DOUBLE_IS_32BITS |
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52 | |
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53 | double |
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54 | log10 (double x) |
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55 | { |
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56 | return (logarithm (x, 1)); |
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57 | } |
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58 | |
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59 | #endif /* _DOUBLE_IS_32BITS */ |
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