#include "f2c.h"
double
pow_ri (real * ap, integer * bp)
{
double pow, x;
integer n;
unsigned long u;
pow = 1;
x = *ap;
n = *bp;
if (n != 0)
if (n < 0)
n = -n;
x = 1 / x;
}
for (u = n;;)
if (u & 01)
pow *= x;
if (u >>= 1)
x *= x;
else
break;
return (pow);