#include <stdio.h>

/* Meget korte navne */
double f (double x);
int ss(double x, double y);
double mo(double x, double y);
int isn(double x);

double frb(double a, double b)
{
    double l = a, u = b;
    while (!isn(f(mo(l, u)))) { 
        if(ss(f(mo(l, u)), f(u)))
            u = mo(l, u);
        else 
            l = mo(l, u);
    }
    return mo(l, u);
}  

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