Answer to Question #306240 in C++ for Babybae

Question

Using function, write and run a C++ program to computer the root of a quadratic equation,stating the conditions for real,complex and double roots respectively in your program

Answer 1

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


float getDiscriminant(float a,float b,float c){
	return b*b - 4*a*c;
}


int main() {
	float a, b, c, x1, x2, discriminant, realPart, imaginaryPart;
	cout << "Enter a: ";
	cin >> a;
	cout << "Enter b: ";
	cin >> b;
	cout << "Enter c: ";
	cin >> c;


	discriminant = getDiscriminant(a,b,c);


	if (discriminant > 0) {
		x1 = (-b + sqrt(discriminant)) / (2*a);
		x2 = (-b - sqrt(discriminant)) / (2*a);
		cout << "Roots are real and different." << endl;
		cout << "x1 = " << x1 << endl;
		cout << "x2 = " << x2 << endl;
	}


	else if (discriminant == 0) {
		cout << "Roots are real and same." << endl;
		x1 = -b/(2*a);
		cout << "x1 = x2 =" << x1 << endl;
	}


	else {
		realPart = -b/(2*a);
		imaginaryPart =sqrt(-discriminant)/(2*a);
		cout << "Roots are complex and different."  << endl;
		cout << "x1 = " << realPart << "+" << imaginaryPart << "i" << endl;
		cout << "x2 = " << realPart << "-" << imaginaryPart << "i" << endl;
	}


	system("pause");


	return 0;
}