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Last change
on this file since 3224 was 1392, checked in by bird, 22 years ago |
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This commit was generated by cvs2svn to compensate for changes in r1391,
which included commits to RCS files with non-trunk default branches.
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Property cvs2svn:cvs-rev
set to
1.1.1.2
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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:
387 bytes
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| 1 | #include "f2c.h"
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| 2 |
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| 3 | integer
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| 4 | pow_ii (integer * ap, integer * bp)
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| 5 | {
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| 6 | integer pow, x, n;
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| 7 | unsigned long u;
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| 8 |
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| 9 | x = *ap;
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| 10 | n = *bp;
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| 11 |
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| 12 | if (n <= 0)
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| 13 | {
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| 14 | if (n == 0 || x == 1)
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| 15 | return 1;
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| 16 | if (x != -1)
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| 17 | return x == 0 ? 1 / x : 0;
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| 18 | n = -n;
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| 19 | }
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| 20 | u = n;
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| 21 | for (pow = 1;;)
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| 22 | {
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| 23 | if (u & 01)
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| 24 | pow *= x;
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| 25 | if (u >>= 1)
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| 26 | x *= x;
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| 27 | else
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| 28 | break;
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| 29 | }
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| 30 | return (pow);
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| 31 | }
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