14 lines
257 B
C
14 lines
257 B
C
|
|
float factln(n)
|
|
int n;
|
|
{
|
|
float gammln();
|
|
void nrerror();
|
|
static float a[101];
|
|
|
|
if (n < 0) nrerror("Negative factorial in routine factln");
|
|
if (n <= 1) return 0.0;
|
|
if (n <= 100) return a[n] ? a[n] : (a[n]=gammln(n+1.0));
|
|
else return gammln(n+1.0);
|
|
}
|