View Compilation Error

0_0_24125279_26483.cpp: In function 'int main()':
0_0_24125279_26483.cpp:89:18: error: 'scanf_s' was not declared in this scope
  scanf_s("%d", &T);
                  ^
0_0_24125279_26483.cpp:92:31: error: 'memset' was not declared in this scope
   memset(str1, 0, sizeof(str1));
                               ^
0_0_24125279_26483.cpp:100:24: error: 'strlen' was not declared in this scope
   int LEN = strlen(str1);
                        ^