C program to find all roots of a quadratic equation

PROGRAM:

#include <stdio.h>

#include <math.h>

int main()

{

    double a, b, c, determinant, root1,root2, realPart, imaginaryPart;

    printf("Enter coefficients a, b and c: ");

    scanf("%lf %lf %lf",&a, &b, &c);

    determinant = b*b-4*a*c;

    if (determinant > 0)

    {

        root1 = (-b+sqrt(determinant))/(2*a);

        root2 = (-b-sqrt(determinant))/(2*a);

        printf("root1 = %.2lf and root2 = %.2lf",root1 , root2);

    }

    else if (determinant == 0)

    {

        root1 = root2 = -b/(2*a);

        printf("root1 = root2 = %.2lf;", root1);

    }

    else

    {

        realPart = -b/(2*a);

        imaginaryPart = sqrt(-determinant)/(2*a);

        printf("root1 = %.2lf+%.2lfi and root2 = %.2f-%.2fi", realPart,

        imaginaryPart, realPart, imaginaryPart);

    }

    return 0;

}   

OUTPUT:

Enter coefficients a, b and c: 2.3

4

5.6

Roots are: -0.87+1.30i and -0.87-1.30i