View Compilation Error

0_0_33706594_3244.cpp: In function 'void init()':
0_0_33706594_3244.cpp:37:8: error: 'dp' was not declared in this scope
     ms(dp);
        ^
0_0_33706594_3244.cpp:3:22: note: in definition of macro 'ms'
 #define ms(a) memset(a, 0, sizeof(a))
                      ^