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Annotation of researchv10no/libF77/pow_di.c, revision 1.1.1.1

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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