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

#define NOT_FOUND 1
#define FOUND 2
#define FOUND_ONE 3
#define INFINITE_MANY 4
#define EPS 1e-20
#define ERR_IO 5
#define OK 0

int search_roots(float a, float b, float c, float *x1, float *x2)
{
    int rc = FOUND;
    float d;
    if ((fabs(a) > EPS) && (abs(c) > EPS)) //??? > 0 // todo fabs
    {
        d = b*b - 4 * a * c;
        if (d > 0)
        {
            printf("1");
            *x1 = (-b + sqrt(d)) / (2 * a);
            *x2 = (-b - sqrt(d)) / (2 * a);
            return rc;
        }
        else if (d == 0)
        {
            printf("2");
            *x1 =  (-b / (2 * a));
            rc = FOUND_ONE;
            return rc;
        }
        else
        {
            printf("3");
            rc = NOT_FOUND;
            return rc;
        }
    }
    else if (abs(a) < EPS)    // a == 0
    {
        if (abs(b) > EPS) // b !=0
        {
            printf("4");
            *x1 = -c/b;
            rc = FOUND_ONE;
            return rc;
        }
        else if ((abs(b) < EPS) && (abs(c) > EPS)) // b==0   c!=0
        {
            printf("6");
            rc = NOT_FOUND;
            return rc;
        }
        else // b==0   c==0
        {
            printf("7");
            rc = INFINITE_MANY;
            return rc;
        }
    }
    else if (abs(c) < EPS)     // c==0
    {
        printf("11");
        *x1 = 0;
        *x2 = -b / a;
        return rc;
    }
    return rc;
}
int main (void)
{
    int rc = OK;
    float x1, x2;
    float a, b, c;
    printf("Input coefficients a, b, c \n");
    if (scanf("%f%f%f", &a, &b, &c) == 3)
    {
        rc = search_roots(a, b, c, &x1, &x2);
        if (rc == FOUND)
        {
            printf("Two roots were found, x1 = %.3f, x2 = %.3f", x1, x2);
        }
        else if (rc == FOUND_ONE)
        {
            printf("One root was found, x = %.3f", x1);
        }
        else if (rc == NOT_FOUND)
        {
            printf("Root were not found");
        }
        else if (rc == INFINITE_MANY)
        {
            printf("There are infinite many roots");
        }
    }
    else
    {
        printf("I/O error");
        rc = ERR_IO;
    }
    return rc;
}