EXP(3) Linux Programmer's Manual EXP(3)

log10, log10f, log10l - base-10 logarithmic function

#include <math.h>

double log10(double x);

float log10f(float x);

long double log10l(long double x);

Link with -lm.

The log10() function returns the base 10 logarithm of x.

The log10() function can return the following errors:

The argument x is negative.
The argument x is zero. The log of zero is not defined.

SVID 3, POSIX, BSD 4.3, ISO 9899. The float and the long double variants are C99 requirements.

cbrt(3), clog10(3), sqrt(3)

2002-07-27

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