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

int main()
{
     float a, b, c, delta, root1, root2;
     int cont;

     do {

          printf("Solving quadratic equation: ax^2+bx+c=0\n");

          do {
                  printf("a = ");
                  scanf("%f", &a);
                  if (a == 0)
                        printf("a can't be equal to 0\n");
          } while (a == 0); 

          printf("b = ");
          scanf("%f", &b);
          printf("c = ");
          scanf("%f", &c);

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

          if (delta > 0)
          {
               root1 = (-b + sqrt(delta)) / (2 * a);
               root2 = (-b - sqrt(delta)) / (2 * a);
               printf("There are two real roots\n");
               printf("They are %.2f and %.2f\n", root1, root2);
          }
          else if (delta == 0)
          {
               root1 = -b / (2 * a);
               printf("There is an equal root\n");
               printf("It is %.2f\n", root1);

          }
          else
          {
               printf("No real root\n");
          }

          printf("\n");
          printf("Continue (yes=1/no=0)? ");
          scanf("%d", &cont);
          printf("\n");

     } while (cont == 1);
     
     return 0;
}