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34 lines
522 B
C
34 lines
522 B
C
#include "f2c.h"
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#ifdef IEEE_drem
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double drem (double, double);
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#else
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#undef abs
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#include <math.h>
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#endif
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double
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r_mod (real * x, real * y)
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{
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#ifdef IEEE_drem
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double xa, ya, z;
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if ((ya = *y) < 0.)
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ya = -ya;
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z = drem (xa = *x, ya);
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if (xa > 0)
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{
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if (z < 0)
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z += ya;
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}
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else if (z > 0)
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z -= ya;
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return z;
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#else
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double quotient;
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if ((quotient = (double) *x / *y) >= 0)
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quotient = floor (quotient);
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else
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quotient = -floor (-quotient);
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return (*x - (*y) * quotient);
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#endif
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}
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