View Compilation Error

0_0_19099758_15936.cpp: In function 'int main()':
0_0_19099758_15936.cpp:4:15: error: 'scanf' was not declared in this scope
  scanf("%d",&N);
               ^
0_0_19099758_15936.cpp:15:23: error: 'printf' was not declared in this scope
    printf("%d\n\n",sum);
                       ^
0_0_19099758_15936.cpp:17:21: error: 'printf' was not declared in this scope
    printf("%d\n",sum);
                     ^