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Last change
on this file since 410 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:
421 bytes
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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 | integer pow_ii(ap, bp) integer *ap, *bp;
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| 5 | #else
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| 6 | integer pow_ii(integer *ap, integer *bp)
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| 7 | #endif
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| 8 | {
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| 9 | integer pow, x, n;
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| 10 | unsigned long u;
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| 11 |
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| 12 | x = *ap;
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| 13 | n = *bp;
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| 14 |
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| 15 | if (n <= 0) {
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| 16 | if (n == 0 || x == 1)
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| 17 | return 1;
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| 18 | if (x != -1)
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| 19 | return x == 0 ? 1/x : 0;
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| 20 | n = -n;
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| 21 | }
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| 22 | u = n;
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| 23 | for(pow = 1; ; )
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| 24 | {
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| 25 | if(u & 01)
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| 26 | pow *= x;
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| 27 | if(u >>= 1)
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| 28 | x *= x;
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| 29 | else
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| 30 | break;
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| 31 | }
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| 32 | return(pow);
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| 33 | }
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