Thread: method of halving the intervals

I'm having some trouble with figuring out how to write a certain program. the program i am supposed to write is meant to read in values from a data file and use those methods to find the roots of a quartic equation (x^4+3*x^3......+4) using the method of halving the interval. I believe i have the right code to obtain values from a data file, but don't know how to proceed from there. Any help would be greatly appreciated.
This is what i have so far.

Code:

#include "stdafx.h"


int main()
{
    double  upperlimit, lowerlimit, b, c, d, e;


    double high, root;
    FILE *inp;


    int file_open = fopen_s(&inp, "U:\\GENG1003\\data.dat", "r");




    int file_read = fscanf_s(inp, "%lf %lf %lf %lf %lf %lf", &b, &c, &d, &e, &lowerlimit, &upperlimit);


    if (file_read == 6)


    {
        printf("For quartic polynomial a=1; b=%lf; c=%lf; d=%lf; e=%lf \n", b, c, d, e);


        printf("Within the domain of %lf < x < %lf \n", lowerlimit, upperlimit);


        high = upperlimit;
    }


    else
        printf("Invalid data \n");




    return 0;

Thank you.