View Compilation Error

0_0_34895946_1843.cpp: In function 'int main()':
0_0_34895946_1843.cpp:17:28: error: 'scanf' was not declared in this scope
  while (scanf("%d", &number) != EOF) {
                            ^
0_0_34895946_1843.cpp:17:33: error: 'EOF' was not declared in this scope
  while (scanf("%d", &number) != EOF) {
                                 ^
0_0_34895946_1843.cpp:19:22: error: 'printf' was not declared in this scope
   printf("%d", result);
                      ^