Answer to Question #300226 in C++ for king

Question

Write a program in C language that calculates the roots of quadratic equation ax 2 +bx+c.

Answer 1

#include <math.h>
#include <stdio.h>
int main() {
	double a, b, c, D, root1, root2, realPart, imagPart;
	printf("Enter coefficient a: ");
	scanf("%lf",&a);
	printf("Enter coefficient b: ");
	scanf("%lf",&b);
	printf("Enter coefficient c: ");
	scanf("%lf",&c);


	D = b * b - 4 * a * c;
	// condition for real and different roots
	if (D > 0) {
		root1 = (-b + sqrt(D)) / (2 * a);
		root2 = (-b - sqrt(D)) / (2 * a);
		printf("root1 = %.2lf\nroot2 = %.2lf", root1, root2);
	}// condition for real and equal roots
	else if (D == 0) {
		root1 = root2 = -b / (2 * a);
		printf("root1 = root2 = %.2lf;", root1);
	}// if roots are not real
	else {
		realPart = -b / (2 * a);
		imagPart = sqrt(-D) / (2 * a);
		printf("root1 = %.2lf+%.2lfi\nroot2 = %.2f-%.2fi", realPart, imagPart, realPart, imagPart);
	}


	scanf("%lf", &a);
	return 0;
}