/in/foo.c: In function 'main':
/in/foo.c:35:2: error: expected ';' before 'for'
  for ( j=1 ;j<n-1 ;j++)
  ^~~
/in/foo.c:17:7: warning: variable 'ch' set but not used [-Wunused-but-set-variable]
  char ch='i';
       ^~