#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#define EPSILON 0.0000001
#define f(x) ((352 * x * x * x) - (64 * x * x) + (198 * x) - 36)
double bisection(double a, double b) {
  double x;
  if (f(a) * f(b) > 0) {
    printf("The values of function at the respective initial guesses must have "
           "opposite signs");
    exit(1);
  }
  x = (a + b) / 2;
  if (f(x) == 0 || fabs(b - a) < EPSILON)
    return x;
  if (f(x) > 0)
    return bisection(x, b);
  return bisection(a, x);
}
int main() {
  printf("Root for f(x) = 352x^3 - 64x^2 + 198x - 36 is %lf",
         bisection(1.6, -4));
}