View Compilation Error

0_0_34827970_14812.cpp: In function 'int main()':
0_0_34827970_14812.cpp:5:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&N)!=EOF)
                     ^
0_0_34827970_14812.cpp:5:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&N)!=EOF)
                        ^
0_0_34827970_14812.cpp:14:17: error: 'printf' was not declared in this scope
  printf("%d",sum);
                 ^