#include<iostream>
#include<cmath>
using namespace std;

int main(){
	int a,b,c,d;
	cout << "Entrez a, b, c et d: ";
	cin >> a >> b >> c >> d;

	int xmin,xmax;
	float ymin,ymax,x;
	do {
		cout << "Entrez xmin et xmax: ";
		cin >> xmin >> xmax;
		ymin = ((a*pow(xmin,3)) + (b*(xmin,2)) + (c*xmin) + d);
		ymax = ((a*pow(xmax,3)) + (b*(xmax,2)) + (c*xmax) + d);
		cout << ymin << endl;
		cout << ymax << endl;
	}while(xmin >= xmax && ((ymin)*(ymax)) < 0);

	float gauche, droite, y;
	gauche = xmin;
	droite = xmax;
	int i;
	i = 0;
	do {
		x = (gauche + droite)/2;
		y = ((a*pow(x,3))+(b*pow(x,2))+(c*x)+d);
		cout << "penis"
		if((gauche*y)>0) {
			gauche = x;
		}
		else {
			droite = x;
		}
		i = ++i;
	}while(fabs(y) >= pow(10,-7));
	cout << "La racine est " << x << " (trouvee en " << i << " iterations)" << endl;
}