Format
#include <math.h>
double gamma(double x);Language Level: ILE C Extension
Threadsafe: Yes.
Description
The gamma() function computes the natural logarithm of the absolute value of G(x) (ln(|G(x)|)), where
The argument x must be a positive real value.
Return Value
The gamma() function returns the value of ln(|G(x)|). If x is a negative value, errno is set to EDOM. If the result causes an overflow, gamma() returns HUGE_VAL and sets errno to ERANGE.
Example that uses gamma()
This example uses gamma() to calculate ln(|G(x)|), where x = 42.
#include <math.h>
#include <stdio.h>
int main(void)
{
double x=42, g_at_x;
g_at_x = exp(gamma(x)); /* g_at_x = 3.345253e+49 */
printf ("The value of G(%4.2lf) is %7.2e\n", x, g_at_x);
}
/************************ Output should be similar to: **********
The value of G(42.00) is 3.35e+49
*/Related Information