Write a C program to find the roots of a Quadratic equation.

Sure, here is a simple C program that calculates the roots of a quadratic equation:

#include <stdio.h>
#include <math.h>

int main() {
    double a, b, c, discriminant, root1, root2, realPart, imaginaryPart;

    printf("Enter coefficients a, b and c: ");
    scanf("%lf %lf %lf",&a, &b, &c);

    discriminant = b*b-4*a*c;

    // condition for real and different roots
    if (discriminant > 0) {
        root1 = (-b+sqrt(discriminant))/(2*a);
        root2 = (-b-sqrt(discriminant))/(2*a);
        printf("Roots are %.2lf and %.2lf",root1 , root2);
    }

    //condition for real and equal roots
    else if (discriminant == 0) {
        root1 = root2 = -b/(2*a);
        printf("Roots are %.2lf and %.2lf", root1, root2);
    }

    // if roots are not real 
    else {
        realPart = -b/(2*a);
        imaginaryPart = sqrt(-discriminant)/(2*a);
        printf("Roots are %.2lf+%.2lfi and %.2lf-%.2lfi", realPart, imaginaryPart, realPart, imaginaryPart);
    }

    return 0;
}   

This program first calculates the discriminant and then finds the roots based on the value of the discriminant. If the discriminant is greater than 0, the roots are real and different. If the discriminant is equal to 0, the roots are real and equal. If the discriminant is less than 0, the roots are complex and different.