Issues with Discriminant program

[LiberianMagic]

I'm having issues with the code below:

#include<iostream>
#include<fstream>
#include<cmath>

using namespace std;

int main()
{
    ifstream fin("input.txt");
    ofstream fout("output.txt");

    float discriminant, A, B, C, root1, root2;

    fin >> A >> B >> C;

    while (A != -99)
    {
        discriminant = (pow(B, 2.0) - 4 * A*C);

        if (A == 0)
        {
            fout << A << "\t" << B << "\t" << C << "\t" << root1 << "\t" << root2 << endl;
        }

        else if (discriminant > 0)
        {
            root1 = (-B - sqrt(discriminant)) / (2.0*A);
            root2 = (-B + sqrt(discriminant)) / (2.0*A);
            fout << A << "\t" << B << "\t" << C << "\t" << root1 << "\t" << root2 << endl;
        }

        else if (discriminant == 0)
        {
            fout << A << "\t" << B << "\t" << C << "\t" << root1 << "\t" << root2 << endl;
        }

        else
        {
            fout << A << "\t" << B << "\t" << C << "\t" << root1 << "\t" << root2 << endl;
        }

        fin >> A >> B >> C;
    }

    fout.close();

    ifstream fin2("output.txt");

    fin2 >> A >> B >> C >> root1 >> root2;

    while (!fin2.eof())
    {
        cout << A << "\t" << B << "\t" << C << "\t" << root1 << "\t" << root2 << endl;

        fin2 >> A >> B >> C >> root1 >> root2;
    }

    cout << endl;
    cout << "Coded by Paye W. Kialain" << "\t"<< endl;
    system("pause");
    return 0;
}

In the project description, I was told to do the following:

Create an input file containing a, b, and c, which I did.

Format the output in a certain way, which is also correct (a table displaying the a, b, and c values along with the 2 calculated roots.)

Use a trailer of 0 0 0 at the end of the data file, which I haven't been able to do without ruining everything so I put -99 -99 -99 as the sentinel line instead.

Satisfy the following criteria:
If the result < 0, there are no real roots to the equation
If the result = 0, there is one real root (-b/2a)
If the result > 0, there are two real roots to the equation
Do not solve for roots if a = 0 – code as an error message

However, the calculations of the roots seem to be off. Are my if statements the issue?

[cire]

However, the calculations of the roots seem to be off. Are my if statements the issue?

In the majority of cases, root1 and root2 are not assigned any value.

[LiberianMagic]

Do you think there's a way to assign specific values to root1 and root2 for each set of a, b and c values?

[cire]

Place the assignments inside the respective if/else bodies.

[LiberianMagic]

I attempted that but the loop didn't stop running...

[cire]

Provide your updated code. Note that your specifications gave you explicit instructions on when not to do a calculation. In that case you need to assign some value to root1/root2 to indicate they have not been calculated (or supply alternate output to the user.)