View Compilation Error

0_0_33995197_14611.cpp: In function 'int main()':
0_0_33995197_14611.cpp:11:13: error: expected unqualified-id before 'sizeof'
   int n = a.sizeof();
             ^
0_0_33995197_14611.cpp:30:35: error: cast from 'int*' to 'char' loses precision [-fpermissive]
      cout << (char)(b + p_code - 1);
                                   ^