View Compilation Error

0_0_14874665_27593.cpp:1:1: error: 'program' does not name a type
 program hdu1000
 ^
0_0_14874665_27593.cpp:3:5: error: 'a' does not name a type
     a,b:integer;
     ^
0_0_14874665_27593.cpp:4:1: error: 'begin' does not name a type
 begin;
 ^
0_0_14874665_27593.cpp:5:8: error: expected unqualified-id before 'while'
        while(not eof) do;
        ^
0_0_14874665_27593.cpp:6:12: error: expected constructor, destructor, or type conversion before '(' token
      readln(a,b);
            ^
0_0_14874665_27593.cpp:7:13: error: expected constructor, destructor, or type conversion before '(' token
      writeln("a+b");
             ^
0_0_14874665_27593.cpp:8:1: error: 'end' does not name a type
 end.
 ^