/*
 * Program to find real roots (if any) of quadratic equation.
 * As developed in class, so may not be 100% correct!
 */
#include <stdio.h>
#include <math.h>

int main(void) {
    float a, b, c;
    printf("enter three coefficients\n");
    if (scanf("%f %f %f", &a, &b, &c) == 3) {
        if (a == 0) printf("special case\n");
        else if ((b*b - 4*a*c) >= 0) {
            printf("%f\n", (-b + sqrt(b*b - 4*a*c))/(2*a));
            printf("%f\n", (-b - sqrt(b*b - 4*a*c))/(2*a));
        }
        else {
            printf("no real roots\n");
        }
    }
    else {
        printf("error\n");
    }
    return 0;
}