View Compilation Error

0_0_33171484_14854.cpp: In function 'int fuck()':
0_0_33171484_14854.cpp:156:6: error: 'dp' was not declared in this scope
  mem(dp,0);
      ^
0_0_33171484_14854.cpp:39:29: note: in definition of macro 'mem'
     #define mem(x,v) memset(x,v,sizeof(x))
                             ^