main.c
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	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <math.h>
	#include <time.h>

	#define boxSize_X 1
	#define boxHalf_X 0.5

	#define NGB_PERIODIC_X(x) (xtmp=(x),(xtmp>boxHalf_X)?(xtmp-boxSize_X):((xtmp<-boxHalf_X)?(xtmp+boxSize_X):xtmp))

	#define NGB_PERIODIC_FLAG_X(x) (xtmp=(x),(xtmp>boxHalf_X)?(1):((xtmp<-boxHalf_X)?(1):0))

	#define NGB_PERIODIC_SIGN_X(x) (xtmp=(x),(xtmp>boxHalf_X)?(-1):((xtmp<-boxHalf_X)?(1):0))


	int main()

	{
	double p,c;
	double d;
	double xtmp;
	int flag;
	int sign;

	c = 0.9;
	p = 0.1;

	printf("%f\n",p-c);

	d = NGB_PERIODIC_X(p - c);

	printf("%f\n",d);

	flag = NGB_PERIODIC_FLAG_X(p - c);
	printf("%d\n",flag);

	sign = NGB_PERIODIC_SIGN_X(p - c);
	printf("%d\n",sign);

	}