View Compilation Error

0_0_18088531_27681.cpp: In function 'int main()':
0_0_18088531_27681.cpp:129:13: error: 'tmp' was not declared in this scope
         mem(tmp);
             ^
0_0_18088531_27681.cpp:14:23: note: in definition of macro 'mem'
 #define mem(a) memset(a, 0, sizeof(a))
                       ^