View Compilation Error

0_0_22917184_12074.cpp: In function 'int main()':
0_0_22917184_12074.cpp:4:2: error: 'cin' was not declared in this scope
  cin >> N;
  ^
0_0_22917184_12074.cpp:5:2: error: 'cout' was not declared in this scope
  cout << endl;
  ^
0_0_22917184_12074.cpp:5:10: error: 'endl' was not declared in this scope
  cout << endl;
          ^
0_0_22917184_12074.cpp:7:9: error: 'gets' was not declared in this scope
   gets(a);
         ^