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<cmath>
double log10 ( double x );
float log10 ( float x );
long double log10 ( long double x );
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
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/* 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;
}
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Output:
log10(1000.000000) = 3.000000
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See also
| log | Compute natural logarithm (function) |
| exp | Compute exponential function (function) |
| pow | Raise to power (function) |
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