0_0_18034203_2933.cpp: In function 'int main()': 0_0_18034203_2933.cpp:12:36: error: 'memset' was not declared in this scope #define mset(a) memset(a,0,sizeof a) ^ 0_0_18034203_2933.cpp:75:3: note: in expansion of macro 'mset' mset(x); ^