View Compilation Error

0_0_27867084_30446.cpp: In function 'int main()':
0_0_27867084_30446.cpp:13:44: error: 'memset' was not declared in this scope
 #define memset(x, i) memset(x, i, sizeof(x))
                                            ^
0_0_27867084_30446.cpp:33:5: note: in expansion of macro 'memset'
     memset(a, 0);
     ^