36 lines
369 B
C
36 lines
369 B
C
#include "f2c.h"
|
|
|
|
#ifdef KR_headers
|
|
double pow_ri(ap, bp) real *ap; integer *bp;
|
|
#else
|
|
double pow_ri(real *ap, integer *bp)
|
|
#endif
|
|
{
|
|
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);
|
|
}
|