View Compilation Error

0_0_19990722_8874.cpp: In function 'int main()':
0_0_19990722_8874.cpp:9:17: error: 'scanf_s' was not declared in this scope
  scanf_s("%d",&t);
                 ^
0_0_19990722_8874.cpp:17:23: error: 'memset' was not declared in this scope
   memset(a,0,sizeof(a));
                       ^