#include<stdio.h>
#include<stdlib.h>


int main(){
	float a=2, b=3, Fa, Fb, Fx;
	float x, accuracy=0.0001;
	//sign of F(a=2) not equal to sign of F(b=3)
	
	while( (b-a) >= accuracy ) {
		x=(a+b)/2.0;
		Fa=a*a*a-2*a-5;  Fb=b*b*b-2*b-5; Fx=x*x*x-2*x-5;
		printf("F at %f=%f  x=%f  a=%f b=%f fa=%f fb=%f\n", x, Fx, x,  a, b, Fa, Fb);
		if(Fa*Fx<0) b=x; else a=x;
		printf("F at %f=%f  x=%f  a=%f b=%f\n", x, Fx, x,  a, b);
		printf("abs(b-a)=%f, accuracy=%f \n", abs(b-a), accuracy );
	}
	printf("Root of X^3+2*x-5 is %f\n", x);
	return 0;
}