View Compilation Error

0_0_14252031_19929.cpp:1:1: error: 'var' does not name a type
 var n:longint;
 ^
0_0_14252031_19929.cpp:3:1: error: 'function' does not name a type
 function lowbit(k:longint):longint;
 ^
0_0_14252031_19929.cpp:4:1: error: 'begin' does not name a type
 begin
 ^
0_0_14252031_19929.cpp:6:1: error: 'end' does not name a type
 end;
 ^
0_0_14252031_19929.cpp:8:1: error: 'begin' does not name a type
 begin
 ^
0_0_14252031_19929.cpp:10:3: error: expected unqualified-id before 'while'
   while n<>0 do
   ^
0_0_14252031_19929.cpp:13:11: error: expected constructor, destructor, or type conversion before '(' token
     readln(n);
           ^
0_0_14252031_19929.cpp:14:3: error: 'end' does not name a type
   end;
   ^
0_0_14252031_19929.cpp:15:1: error: 'end' does not name a type
 end.
 ^