C++ Program to Find Prime Number using Constructor

#include<iostream.h>
#include<conio.h>
class prime
{
    int a,j,i;
    public:
    prime(int x)
  {
    a=x;
  }
  void calculate()
   {
     j=1;
   {
     for(i=2;i<=a/2;i++)

       if(a%i==0)
        {
          j=0;
          break;
         }
         else
         {
           j=1;
          }
          }
          }

void show()
       {
         if(j==1)
         cout<< "\nThis Number is prime Number!\n";
         else
         cout<<"\nThis Number is Not prime!\n";
        }
};

void main()
{
    int a;
    cout<<"\nEnter any Number: ";
    cin>>a;
    prime obj(a);
    obj.calculate();
    obj.show();
    getch();
}

Output: