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41 lines
621 B
C
41 lines
621 B
C
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#include "f2c.h"
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#ifdef KR_headers
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#ifdef IEEE_drem
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double drem();
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#else
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double floor();
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#endif
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double d_mod(x,y) doublereal *x, *y;
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#else
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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 d_mod(doublereal *x, doublereal *y)
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#endif
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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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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 = *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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