View Compilation Error

0_0_21508422_19606.cpp: In function 'int main()':
0_0_21508422_19606.cpp:12:48: error: 'memset' was not declared in this scope
 #define MEMSET(name) memset(name,0,sizeof(name))
                                                ^
0_0_21508422_19606.cpp:58:3: note: in expansion of macro 'MEMSET'
   MEMSET(now_size);
   ^