Compute the logarithm (base 10) of a number
#include <math.h> double log10( double x ); float log10f( float x ); long double log10l( long double x );
These functions compute the base 10 logarithm of x:
log10 x
A domain error occurs if x is negative. A range error occurs if x is zero.
The base 10 logarithm of x. For finite values of x less than zero, these functions return NaN. The return value when x is -Inf is NaN.
#include <stdio.h> #include <stdlib.h> #include <math.h> int main( void ) { printf( "%f\n", log10(.5) ); return EXIT_SUCCESS; }
produces the output:
-0.301030
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |