#include "f2c.h"

double d_mod(x,y)
doublereal *x, *y;
{
#ifdef IEEE_drem
	double drem(), 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 floor(), quotient;
	if( (quotient = *x / *y) >= 0)
		quotient = floor(quotient);
	else
		quotient = -floor(-quotient);
	return(*x - (*y) * quotient );
#endif
}