/in/foo.cc: In function 'int main()':
/in/foo.cc:8:9: error: conflicting declaration 'int a [0]'
  int a[0]=0;
         ^
/in/foo.cc:7:6: note: previous declaration as 'int a [10000]'
  int a[10000];
      ^
/in/foo.cc:9:11: error: conflicting declaration 'int a [(n + 1)]'
  int a[n+1]=0;
           ^
/in/foo.cc:7:6: note: previous declaration as 'int a [10000]'
  int a[10000];
      ^