Question

How would I write a c++ program from this following word problem? 3. Use the pow() and sqrt() functions to compute the roots of a quadratic equation. Enter the three coefficients with a single input statement. Warning: if you give sqrt() a negative value, the function cannot produce a valid answer.

Answer 1

#include <iostream>
#include <cmath>
using namespace std;

int main(int argc, char* argv[])
{

    double a, b, c, root1, root2, d;

    cout << "Enter quadratic coefficients a,b,c: ";
    cin >> a;
    cin >> b;
    cin >> c;

   d = b * b - 4.0 * a * c;
    if (d < 0) {
        cout << " no real roots\n";
    }
    else if (d == 0) {
        root1 = -b / (2.0 * a);
       cout<<"Roots are "<<root1<<" and "<<root1<<endl;   
    }
    else if (d > 0) {
        root1 = (-b + sqrt(d)) / (2.0 * a);
        root2 = (-b - sqrt(d)) / (2.0 * a);
        cout<<"Roots are "<<root1<<" and "<<root2<<endl;
    }
    return 0;
}