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Last change
on this file since 645 was 2, checked in by bird, 23 years ago |
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Initial revision
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-
Property cvs2svn:cvs-rev
set to
1.1
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Property svn:eol-style
set to
native
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Property svn:executable
set to
*
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File size:
369 bytes
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| Line | |
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| 1 | #include "f2c.h"
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| 2 |
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| 3 | #ifdef KR_headers
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| 4 | double pow_ri(ap, bp) real *ap; integer *bp;
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| 5 | #else
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| 6 | double pow_ri(real *ap, integer *bp)
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| 7 | #endif
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| 8 | {
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| 9 | double pow, x;
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| 10 | integer n;
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| 11 | unsigned long u;
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| 12 |
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| 13 | pow = 1;
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| 14 | x = *ap;
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| 15 | n = *bp;
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| 16 |
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| 17 | if(n != 0)
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| 18 | {
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| 19 | if(n < 0)
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| 20 | {
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| 21 | n = -n;
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| 22 | x = 1/x;
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| 23 | }
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| 24 | for(u = n; ; )
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| 25 | {
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| 26 | if(u & 01)
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| 27 | pow *= x;
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| 28 | if(u >>= 1)
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| 29 | x *= x;
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| 30 | else
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| 31 | break;
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| 32 | }
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| 33 | }
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| 34 | return(pow);
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| 35 | }
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