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Last change
on this file since 3567 was
11,
checked in by aslmd, 14 years ago
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spiga@svn-planeto:ajoute le modele meso-echelle martien
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File size:
321 bytes
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| 1 | #include <stdio.h> |
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| 2 | #include <stdlib.h> |
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| 3 | |
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| 4 | /* |
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| 5 | * w. ebisuzaki |
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| 6 | * |
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| 7 | * return x**y |
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| 8 | * |
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| 9 | * |
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| 10 | * input: double x |
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| 11 | * int y |
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| 12 | */ |
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| 13 | double int_power(double x, int y) { |
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| 14 | |
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| 15 | double value; |
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| 16 | |
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| 17 | if (y < 0) { |
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| 18 | y = -y; |
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| 19 | x = 1.0 / x; |
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| 20 | } |
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| 21 | value = 1.0; |
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| 22 | |
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| 23 | while (y) { |
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| 24 | if (y & 1) { |
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| 25 | value *= x; |
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| 26 | } |
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| 27 | x = x * x; |
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| 28 | y >>= 1; |
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| 29 | } |
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| 30 | return value; |
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| 31 | } |
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