log10, log10l
Remonter à Math.h - Index
Header File
math.h
Category
Math Routines
Prototype
double log10(double x);
long double log10l(long double x);
Description
log10 calculates the base ten logarithm of x.
log10l is the long double version; it takes a long double argument and returns a long double result.
Return Value
On success, log10 (or log10l) returns the calculated value log base ten of x.
If the argument x passed to these functions is real and less than 0, the global variable errno is set to
EDOM |
Domain error |
If x is 0, these functions return the value negative HUGE_VAL (log10) or _LHUGE_VAL (log10l). Error handling for these routines can be modified through the functions _matherr and _matherrl.
Example
#include <math.h>
#include <stdio.h>
int main(void)
{
double result;
double x = 800.6872;
result = log10(x);
printf("The common log of %lf is %lf\n", x, result);
return 0;
}
Portability
POSIX | Win32 | ANSI C | ANSI C++ | |
---|---|---|---|---|
log10 |
+ |
+ |
+ |
+ |
log10l |
+ |
+ |
+ |