double log10 ( double x );
float log10 ( float x );
long double log10 ( long double x ); |
<cmath>
|
Compute common logarithm
Returns the common (base-10) logarithm of x.
In C++, this function is overloaded in <complex> and <valarray> (see complex log10 and valarray log10).
Parameters
- x
- Floating point value.
If the argument is negative, a domain error occurs, setting the global variable errno to the value EDOM.
If it is zero, the function returns a negative HUGE_VAL and sets the value of the global variable errno to the ERANGE value.
Return Value
Common logarithm of
x, for values of
x greater than zero.
Portability
In C, only the
double version of this function exists with this name.
Example
/* log10 example */
#include <stdio.h>
#include <math.h>
int main ()
{
double param, result;
param = 1000.0;
result = log10 (param);
printf ("log10(%lf) = %lf\n", param, result );
return 0;
} |
Output:
log10(1000.000000) = 3.000000
|
See also
| log | Compute natural logarithm (function) |
| exp | Compute exponential function (function) |
| pow | Raise to power (function) |
