8_Hollow_Butterfly.cpp

#include<iostream>
using namespace std;
int main()
{int n;
cin>>n;
for(int i=1;i<=n;i++)
  {int space=((2*n)-(2*i));
   for( int j=1;j<=i;j++)
     {if(j==1||j==i)
     {cout<<"*";
     }
     else
     {cout<<" ";
     }
     }
     for(int j=1;j<=space;j++)
       {cout<<" ";
       }
     for(int j=1;j<=i;j++)
       {if(j==1||j==i)
     {cout<<"*";
     }
     else
     {cout<<" ";
     }
       }
    cout<<endl;
  }
for(int i=n;i>=1;i--)
  {int space=2*n-2*i;
   for( int j=1;j<=i;j++)
     {if(j==1||j==i)
     {cout<<"*";
     }
     else
     {cout<<" ";
     }
     }
     for(int j=1;j<=space;j++)
       {cout<<" ";
       }
     for(int j=1;j<=i;j++)
     {if(j==1||j==i)
     {cout<<"*";
     }
     else
     {cout<<" ";
     }
     }
    cout<<endl;
  }

 return 0;
}