pow_di.c

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#include "f2c.h"

#ifdef KR_headers
double pow_di(ap, bp) doublereal *ap; integer *bp;
#else
double pow_di(doublereal *ap, integer *bp)
#endif
{
double pow, x;
integer n;

pow = 1;
x = *ap;
n = *bp;

if(n != 0)
        {
        if(n < 0)
                {
                n = -n;
                x = 1/x;
                }
        for( ; ; )
                {
                if(n & 01)
                        pow *= x;
                if(n >>= 1)
                        x *= x;
                else
                        break;
                }
        }
return(pow);
}

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