Program untuk menghitung akar kuadrat dengan Codeblock (C++)

#include <iostream>
#include "math.h"
using namespace std;
int main()
{
   int a, b, c;
   float d, x1, x2;
   cout << "Masukkan nilai a = ";
   cin >> a;
   cout << "Masukkan nilai b = ";
   cin >> b;
   cout << "Masukkan nilai c = ";
   cin >> c;
   d = (b*b) - (4*a*c);
   if (d>=0){
        x1 = (-b+sqrt(d))/2*a;
        x2 = (-b-sqrt(d))/2*a;
        cout << "Hasil akar kuadrat =" << endl;
        cout << "x1 = " << x1 << endl;
        cout << "x2 = " << x2 << endl;
   }
   else{
        cout << "bukan merupakan akar kuadrat";
   }
}