View Compilation Error

0_0_16573218_29889.cpp: In function 'int main()':
0_0_16573218_29889.cpp:5:20: error: 'scanf' was not declared in this scope
  scanf("%d",&number);
                    ^
0_0_16573218_29889.cpp:8:17: error: 'printf' was not declared in this scope
  printf("%d",sum);
                 ^