Write a Program for Finding the Roots of a Quadratic Equation

C++// C++ program to find // Roots of a quadratic equation #include <iostream> #include <math.h> using namespace std; // Prints roots of quadratic equation ax*2 + bx + c void findRoots(int a, int b, int c) { // If a is 0, then equation is not quadratic if (a == 0) { cout << "Invalid"; return; } // Formulae to calculate D int d = b * b - 4 * a * c; // Formulae to calculate // square root of D double sqrt_val = sqrt(abs(d)); // Conditons for checking root if (d > 0) { cout << "Roots are real and different \n"; cout << (double)(-b + sqrt_val) / (2 * a) << "\n" << (double)(-b - sqrt_val) / (2 * a); } else if (d == 0) { cout << "Roots are real and same \n"; cout << -(double)b / (2 * a); } else { cout << "Roots are complex \n"; cout << -(double)b / (2 * a) << " + i" << sqrt_val / (2 * a) << "\n" << -(double)b / (2 * a) << " - i" << sqrt_val / (2 * a); } } int main() { int a = 1, b = 4, c = 4; findRoots(a, b, c); return 0; }

Output

Roots are real and same 
-2