#include <iostream>
#include <iomanip>
#include <cmath>

// Définition de variables globales
float v1 = 1.2;
float v2 = 1.3;
float v3 = 1.3001;
float v4 = 1.3001001;

/* ------------------------------------------------------------------
    QUOI
       Fonction principale
       
   ------------------------------------------------------------------ */
int main() {

	float diff_v1_v2 = v1 - v2;
	float diff_v2_v3 = v2 - v3;

	std::cout << setprecision(10);

	std::cout << "v1-v2 = " << diff_v1_v2 << std::endl;
	std::cout << "v2-v3 = " << diff_v2_v3 << std::endl;

	// Comparaison de valeurs flottantes
	float diff_abs = fabs(v3 - v4);
	std::cout << "|v3-v4| = " << diff_abs << std::endl;

	if (diff_abs < 1E-6) 
		std::cout << "v3 = v4" << std::endl;
	else
		std::cout << "v3 != v4" << std::endl;
	return 0;
}