32 lines
416 B
C
32 lines
416 B
C
#include "f2c.h"
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longint
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pow_qq (longint * ap, longint * bp)
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{
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longint pow, x, n;
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unsigned long long u; /* system-dependent */
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x = *ap;
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n = *bp;
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if (n <= 0)
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{
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if (n == 0 || x == 1)
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return 1;
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if (x != -1)
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return x == 0 ? 1 / x : 0;
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n = -n;
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}
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u = n;
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for (pow = 1;;)
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{
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if (u & 01)
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pow *= x;
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if (u >>= 1)
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x *= x;
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else
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break;
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}
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return (pow);
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}
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