View Compilation Error

0_0_31909759_17496.cpp: In function 'int main()':
0_0_31909759_17496.cpp:4:15: error: 'scanf' was not declared in this scope
  scanf("%d",&i);
               ^
0_0_31909759_17496.cpp:5:10: error: 'getchar' was not declared in this scope
  getchar();
          ^
0_0_31909759_17496.cpp:21:22: error: 'printf' was not declared in this scope
  printf("%d\n\n",l[j]);
                      ^
0_0_31909759_17496.cpp:22:20: error: 'printf' was not declared in this scope
  printf("%d\n",l[i]);
                    ^