Answer to Question #151748 in C++ for Nadia zafar

Question

If coefficients of quadratic equations are known then write a program to find the roots of quadratic equation in closed form.
Also specify the nature of roots(the roots can be real, imaginary or equal)
Don't ask user to input any value.
Don't use these variables names a, b, c, d, disc.

Answer 1

#include <iostream>
#include <cmath>
using namespace std;
int main () {
    // we declare an array for store coefficients of quadratic equation
    // for example x^2+5x+6=0
    int coefficients[3] = {1, 5, 6};
    float root1, root2;
    float discriminant;
    discriminant = pow(coefficients[1], 2) - 4 * coefficients[0]*coefficients[2];
    if (discriminant > 0) {
        cout << "The quadratic equation has two real numbers and they are: " << endl;
        root1 = (-coefficients[1] + sqrt(discriminant)) / 2 * coefficients[0];
        root2 = (-coefficients[1] - sqrt(discriminant)) / 2 * coefficients[0];
        cout << root1 << " " << root2;
    }
    else if (discriminant == 0) {
        cout << "The quadratic equation has two identical roots and it is: " << endl;
        cout << -coefficients[1] / 2. * coefficients[0];
    }
    else {
        cout << "The quadratic equation hasn't roots";
    }


    return 0;