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Annotation of researchv10no/libF77/pow_di.c, revision 1.1

1.1     ! root        1: #include "f2c.h"
        !             2: 
        !             3: #ifdef KR_headers
        !             4: double pow_di(ap, bp) doublereal *ap; integer *bp;
        !             5: #else
        !             6: double pow_di(doublereal *ap, integer *bp)
        !             7: #endif
        !             8: {
        !             9: double pow, x;
        !            10: integer n;
        !            11: 
        !            12: pow = 1;
        !            13: x = *ap;
        !            14: n = *bp;
        !            15: 
        !            16: if(n != 0)
        !            17:        {
        !            18:        if(n < 0)
        !            19:                {
        !            20:                n = -n;
        !            21:                x = 1/x;
        !            22:                }
        !            23:        for( ; ; )
        !            24:                {
        !            25:                if(n & 01)
        !            26:                        pow *= x;
        !            27:                if(n >>= 1)
        !            28:                        x *= x;
        !            29:                else
        !            30:                        break;
        !            31:                }
        !            32:        }
        !            33: return(pow);
        !            34: }

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