Trailing-Edge
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PDP-10 Archives
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SRI_NIC_PERM_FS_1_19910112
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c/lib5/math/log10.c
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/*
* +++ NAME +++
*
* LOG10 Double precision common log
*
* +++ INDEX +++
*
* LOG10
* machine independent routines
* math libraries
*
* +++ DESCRIPTION +++
*
* Returns double precision common log of double precision
* floating point argument.
*
* +++ USAGE +++
*
* double log10(x)
* double x;
*
* +++ REFERENCES +++
*
* PDP-11 Fortran IV-plus users guide, Digital Equip. Corp.,
* 1975, pp. B-3.
*
* +++ RESTRICTIONS +++
*
* For precision information refer to documentation of the
* floating point library routines called.
*
* +++ PROGRAMMER +++
*
* Fred Fish
* Goodyear Aerospace Corp, Arizona Div.
* (602) 932-7000 work
* (602) 894-6881 home
*
* Updated Dec 85 for inclusion in standard math library. This routine
* now conforms with the description of the log10 function as defined in
* Harbison & Steele's "C: A Reference Manual", section 11.3.17
*
* +++ INTERNALS +++
*
* Computes log10(X) from:
*
* log10(x) = log10(e) * log(X)
*
* ---
*/
#include "math.h"
double log10(x)
double x;
{
return LOG10E * log(x);
}