View Compilation Error

0_0_30687999_5352.cpp: In function 'int main()':
0_0_30687999_5352.cpp:5:27: error: 'scanf' was not declared in this scope
     while(~scanf("%lld",&n))
                           ^
0_0_30687999_5352.cpp:8:30: error: 'printf' was not declared in this scope
         printf("%lld\n\n",sum);
                              ^