View Compilation Error

0_0_32064816_6036.cpp: In function 'int main()':
0_0_32064816_6036.cpp:11:8: error: 'cin' was not declared in this scope
  while(cin>>n)
        ^
0_0_32064816_6036.cpp:12:3: error: 'cout' was not declared in this scope
   cout<<rpg[n]<<endl;
   ^
0_0_32064816_6036.cpp:12:17: error: 'endl' was not declared in this scope
   cout<<rpg[n]<<endl;
                 ^