View Compilation Error

0_0_19426795_30499.cpp: In function 'int main()':
0_0_19426795_30499.cpp:10:33: error: 'memset' was not declared in this scope
     memset(extra,0,sizeof(extra));
                                 ^
0_0_19426795_30499.cpp:12:24: error: 'scanf_s' was not declared in this scope
         scanf_s("%d",&x);
                        ^