#include <math.h>
#include <errno.h>
extern	int	errno;
double	errcheck();

double Log(x)
	double x;
{
	return errcheck(log(x), "log");
}
double Log10(x)
	double x;
{
	return errcheck(log10(x), "log10");
}
double Exp(x)
	double x;
{
	return errcheck(exp(x), "exp");
}
double Sqrt(x)
	double x;
{
	return errcheck(sqrt(x), "sqrt");
}
double Pow(x, y)
	double x, y;
{
	return errcheck(pow(x,y), "exponentiation");
}
double errcheck(d, s)	/* check result of library call */
	double d;
	char *s;
{
	if (errno == EDOM) {
		errno = 0;
		execerror(s, "argument out of domain");
	} else if (errno == ERANGE) {
		errno = 0;
		execerror(s, "result out of range");
	}
	return d;
}