#include <stdio.h>
 
double f (double x);
int sameSign(double x, double y);
double middleOf(double x, double y);
int isSmallNumber(double x);

/* En anden variant af inkonsistent indrykning */
double findRootBetween(double a, double b)
{
  double l = a, u = b;
    while (!isSmallNumber(f(middleOf(l, u)))) { 
      if(sameSign(f(middleOf(l, u)), f(u)))
            u = middleOf(l, u);
      else 
        l = middleOf(l, u);
    }
      return middleOf(l, u);
}  

int main (void)
{
findRootBetween(-3.0, 5.0);
}