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#using namespace std;
 
int main() {
  int n,i;
  cin >>n;
   for ( i=0; i<=n/2;i++){
   	for ( int j1=1;j1<=n-(n-i);j1++)
   	 cout <<".";
   	  for ( int j2=1;j2<=n-2*i;j2++)
   	 cout <<"*";
   	 for ( int j3=1;j3<=n-(n-i);j3++)
   	 cout <<".";
   	 cout <<"\n";
   }
   for ( i=(n/2)-1; i>=0;i--){
   	for ( int j1=1;j1<=n-(n-i);j1++)
   	 cout <<".";
   	  for ( int j2=1;j2<=n-2*i;j2++)
   	 cout <<"*";
   	 for ( int j3=1;j3<=n-(n-i);j3++)
   	 cout <<".";
   	 cout <<"\n";
   }
	return 0;
}

prog.cpp:1:1: error: ‘include’ does not name a type
 include <iostream>
 ^~~~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:6:3: error: ‘cin’ was not declared in this scope
   cin >>n;
   ^~~
prog.cpp:9:6: error: ‘cout’ was not declared in this scope
      cout <<".";
      ^~~~
prog.cpp:11:6: error: ‘cout’ was not declared in this scope
      cout <<"*";
      ^~~~
prog.cpp:13:6: error: ‘cout’ was not declared in this scope
      cout <<".";
      ^~~~
prog.cpp:14:6: error: ‘cout’ was not declared in this scope
      cout <<"\n";
      ^~~~
prog.cpp:18:6: error: ‘cout’ was not declared in this scope
      cout <<".";
      ^~~~
prog.cpp:20:6: error: ‘cout’ was not declared in this scope
      cout <<"*";
      ^~~~
prog.cpp:22:6: error: ‘cout’ was not declared in this scope
      cout <<".";
      ^~~~
prog.cpp:23:6: error: ‘cout’ was not declared in this scope
      cout <<"\n";
      ^~~~

Standard output is empty