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