View Compilation Error

0_0_39586675_16512.cpp:2:9: error: expected unqualified-id before 'while'
    2 |         while (scanf("%d", &n)!= EOF)
      |         ^~~~~
0_0_39586675_16512.cpp:26:9: error: expected unqualified-id before 'return'
   26 |         return 0;
      |         ^~~~~~
0_0_39586675_16512.cpp:28:1: error: expected declaration before '}' token
   28 | }
      | ^