root-rek.c - En rekursiv version af funktionen findRootBetween.

Lektion 8 - slide 9 : 27 Program 3

double findRootBetween(double l, double u){
  if (isSmallNumber(f(middleOf(l,u))))
     return middleOf(l,u);
  else if (sameSign(f(middleOf(l,u)), f(u)))
     return findRootBetween(l, middleOf(l,u));
  else if (!sameSign(f(middleOf(l,u)), f(u)))
     return findRootBetween(middleOf(l,u),u);
  else exit (-1);
}