#include <bits/stdc++.h>
using namespace std;
#define f(x) pow(x,3)+3*x*x-5

int main() {

    float x0, x1, x2, f0, f1, f2, e;
    int step = 1;
up:
    printf("\nEnter two initial guesses:\n");
    scanf("%f%f", &x0, &x1);
    printf("Enter tolerable error: \n");
    scanf("%f", &e);
    f0 = f(x0);
    f1 = f(x1);
    if(f0*f1>0.0) {
        printf("Incorrect Initial Guesses.\n");
        goto up;

    }
    printf("\nStep\t\tx0\t\txl\t\tx2\t\tf(x2)\n");
    do {
        x2 = (x0 + x1)/2;
        f2 = f(x2);
        printf("%d\t\t%f\t%f\t%f\t%f\n", step, x0, x1, x2, f2);
        if(f0*f2< 0){
            x1 = x2;
            f1 = f2;
        }else{
            x0 = x2;
            f0 = f2;
        }
        step++;
        }while(fabs(f2)>e);
        printf("\nRoot is: %f", x2);
    return 0;
}