C++ examples for Operator:Arithmetic Operator
Solves for the roots of a quadratic equation
#include <iostream> #include <cmath> using namespace std; int main()// w w w.j a v a2 s . c om { double a, b, c, disc, root1, root2; cout << "calculates the roots of a quadratic equation of the form:ax^2 + bx + c = 0\n\n"; cout << "Please enter values for a, b, and c: "; cin >> a >> b >> c; if (a == 0.0 && b == 0.0) cout << "The equation is degenerate and has no roots.\n"; else if (a == 0.0) cout << "The equation has the single root x = " << -c/b << endl; else { disc = pow(b,2.0) - 4 * a * c; // calculate discriminant if (disc > 0.0) { disc = sqrt(disc); root1 = (-b + disc) / (2 * a); root2 = (-b - disc) / (2 * a); cout << "The two real roots are " << root1 << " and " << root2 << endl; } else if (disc < 0.0) cout << "Both roots are imaginary.\n"; else cout << "Both roots are equal to " << -b / (2 * a) << endl; } return 0; }