norm_angle.c
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	#include<stdio.h>
	#include<math.h>
	#include "fonction.h"
	#include "constant.h"
	#include"dimension.h"
	#include "structure.h"

	double norm_angle(double theta, double npi)
	{
	double N;
	double t, d;
	int n;

	n = (int) (theta / npi);
	N = n;
	d = theta - N * npi;
	if (d > .5*npi)
	N += 1.;

	t = theta - N * npi;
	return(t);
	}