View Compilation Error

0_0_18339651_14446.cpp: In function 'void init()':
0_0_18339651_14446.cpp:11:27: error: 'memset' was not declared in this scope
     memset(C, 0, sizeof(C));
                           ^
0_0_18339651_14446.cpp: In function 'int main()':
0_0_18339651_14446.cpp:28:31: error: 'memset' was not declared in this scope
         memset(A, 0, sizeof(A));
                               ^