View Compilation Error

0_0_32586182_5941.cpp: In function 'int main()':
0_0_32586182_5941.cpp:4:25: error: 'scanf_s' was not declared in this scope
  scanf_s("%d %d", &a, &b);
                         ^
0_0_32586182_5941.cpp:5:20: error: 'printf' was not declared in this scope
  printf("%d", a + b);
                    ^
0_0_32586182_5941.cpp:6:16: error: 'system' was not declared in this scope
  system("pause");
                ^