package ecuacion2;

public abstract class Ecuacion {
    protected static final double CERO=1e-10;
    protected static final double ERROR=0.001;
    protected final int MAXITER=200;

    public double puntoMedio(double a, double b)throws RaizExcepcion{
        double m, ym;
        int iter=0;
        do{
            m=(a+b)/2;
            ym=f(m);
            if(Math.abs(ym)<CERO)           break;
            if(Math.abs((a-b)/m)<ERROR)     break;

            if((f(a)*ym)<0)     b=m;
            else                a=m;
            iter++;
        }while(iter<MAXITER);
        if(iter==MAXITER){
            throw new RaizExcepcion("No se ha encontrado la raíz");
        }
        return m;
    }

    abstract public double f(double x);
}

class RaizExcepcion extends Exception {
  public RaizExcepcion(String s) {
         super(s);
  }
}