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log
Usage
#include <math.h>
double log(double x);
Description
log returns the natural logarithm of x. The value of x must be > 0.
Example
#include <math.h>
#include <stdio.h>
main(int argc,char **argv)
{
double d,result;
d = atof(argv[1]);
result = log(d);
printf("The log of %.2f is %f\n",d,result);
}
Return Value
The log function returns the logarithm result or domain error if x <
0, range error if x == 0.