Menghitung akar-akar persamaan kuadrat

flowchart dan program kasus 3.3 

#include <iostream>
#include <string>
#include <math.h>
using namespace std;

int main()
{
   string raptor_prompt_variable_zzyz;
   float x2;
   float D;
   int b;
   int c;
   float x1;
   int a;
   raptor_prompt_variable_zzyz ="A = ";
   cout << raptor_prompt_variable_zzyz << endl;
   cin >> a;
   if (a!=0)
   {
      raptor_prompt_variable_zzyz ="B = ";
      cout << raptor_prompt_variable_zzyz << endl;
      cin >> b;
      raptor_prompt_variable_zzyz ="C = ";
      cout << raptor_prompt_variable_zzyz << endl;
      cin >> c;
      D =b^2-4*a*c;
      if (D==0)
      {
         x1 =-b/2*a;
         x2 =x1;
         cout << "x1 = "<<x1<<" dan x2 = "<<x2 << endl;      }
      else
      {
         if (D>0)
         {
            x1 =(-b+sqrt(D))/2*a;
            x2 =(-b-sqrt(D))/2*a;
            cout << "x1 = "<<x1<<" dan x2 = "<<x2 << endl;         }
         else
         {
            cout << "akar imajiner" << endl;         }
      }
   }
   else 
   {
      cout << "bukan persamaan kuadrat" << endl;   }
system("pause");
   return 0;
}