#include <stdio.h>
#include <math.h>
double delta (double a,double b,double c);

int main()
{
float x1,x2,a=2,b=3,c=1,d;
d=delta(a,b,c);
if (d<0)
      printf("Non esistono radici reali\n");
      else
      {
      if (delta==0)
               x1=x2=-b/(2*a);
           else
               {
               x1=(-b+sqrt(d))/(2*a);
               x2=(-b-sqrt(d))/(2*a);
               }   
      printf("x1=%f,x2=%f\n",x1,x2);
      }
return 0;
}

double delta (double a,double b,double c) 
{
 double res;
 res=b*b-4*a*c;
 return res;
}