View Compilation Error

0_0_37018351_9209.cpp: In function 'int main()':
0_0_37018351_9209.cpp:6:16: error: 'scanf' was not declared in this scope
  scanf("%d", &N);
                ^
0_0_37018351_9209.cpp:9:11: error: 'getchar' was not declared in this scope
   getchar();
           ^
0_0_37018351_9209.cpp:15:24: error: 'printf' was not declared in this scope
    printf("%d\n", A + B);
                        ^