#include<iostream>
#include<math.h>
using namespace std;

/* Fonction creneau */

double a = 4.5;  // Variables globales
double b = 1.0;

int creneau(double x){
  if (fabs(x-a) > b/2.)
    return 0;
  else
    return 1;
}

int main(){
  double x;
  
  cout << "a = " << a << " ; b = " << b << endl;
  cout << "Valeur de x ? ";
  cin >> x;
  cout << "Theta(x-(a-b/2)) - Theta(x-(a+b/2)) = " << creneau(x) << endl;
  return 0;
}