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

double calculate_positive_root(int a, int b, int c);
double calculate_negative_root(int a, int b, int c);

int main()
{
   int a = 2, b = 3, c = 1;
   double posRoot = calculate_positive_root(a, b, c);
   double negRoot = calculate_negative_root(a, b, c);

   printf("The roots of %d*x^2 + %dx + %d are %.2f and %.2f\n", a, b, c, negRoot, posRoot);

   return 0;
}

double calculate_positive_root(int a, int b, int c) {
   double bSqrd = pow(b, 2);
   double toSqrt = bSqrd - (4 * a * c);
   if (toSqrt < 0) {
      printf("Error: cannot calcualte positive root\n");
      exit(1);
   }
   double sqrtVal = sqrt(toSqrt);
   return (-1 * b) + sqrtVal;
}

double calculate_negative_root(int a, int b, int c) {
   double bSqrd = pow(b, 2);
   double toSqrt = bSqrd - (4 * a * c);
   if (toSqrt < 0) {
      printf("Error: cannot calcualte negative root\n");
      exit(1);
   }
   double sqrtVal = sqrt(toSqrt);
   return (-1 * b) - sqrtVal;
}