#include <stdio.h>
#define ROUND3(number) ( (int)( (number) * 1000 + 0.5 ) / 1000.0 )
int main()
{
	double A = 0.0306880000, B = 0.0396640000;
	printf ("A = %5.3f; B = %5.3f\n", A, B);
	double AB = ROUND3(A) + ROUND3(B);
	printf ("ROUND3(A) = %f, ROUND3(B) = %f\n", ROUND3(A), ROUND3(B));
	printf ("AB = %f\n", AB);
	
	return 0;
}