/*
 * Program to find roots of quadratic equation.
 */
#include <stdio.h>
#include <math.h>

int main(void) {

    float a, b, c;

    printf("enter coefficients a, b, c:\n");

    if (scanf("%f %f %f", &a, &b, &c) != 3) {
        /* FIXME improve this error message */
        printf("error\n"); return 1;
    }

    printf("a = %f, b = %f, c = %f\n", a, b, c);

    /* FIXME there are some other cases to consider here! */

    if ((b*b - 4*a*c) < 0) {
        printf("no real roots\n");
    }
    else {
        printf("roots are %f and %f\n", 
                (-b + sqrt(b*b - 4*a*c)) / (2*a),
                (-b - sqrt(b*b - 4*a*c)) / (2*a));
    }

    return 0;
}