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Define M_PI (not part of C89)
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@@ -19,6 +19,10 @@
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#include <string.h>
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.1415926535897932384626433832795
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#endif
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#define PI M_PI
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#define TWOPI (2 * M_PI)
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