View Compilation Error

0_0_17584566_15866.cpp: In function 'int main()':
0_0_17584566_15866.cpp:4:18: error: 'scanf' was not declared in this scope
     scanf("%d",&i);
                  ^
0_0_17584566_15866.cpp:5:13: error: 'getchar' was not declared in this scope
     getchar();
             ^
0_0_17584566_15866.cpp:21:29: error: 'printf' was not declared in this scope
         printf("%d\n\n",l[j]);
                             ^
0_0_17584566_15866.cpp:22:23: error: 'printf' was not declared in this scope
     printf("%d\n",l[i]);
                       ^