View Compilation Error

0_0_17249328_11223.cpp: In function 'int main()':
0_0_17249328_11223.cpp:60:3: error: 'cin' was not declared in this scope
   cin.getline(a,15);
   ^
0_0_17249328_11223.cpp:67:8: error: 'cin' was not declared in this scope
  while(cin>>a)
        ^
0_0_17249328_11223.cpp:69:3: error: 'cout' was not declared in this scope
   cout<<query(a)<<endl;
   ^
0_0_17249328_11223.cpp:69:19: error: 'endl' was not declared in this scope
   cout<<query(a)<<endl;
                   ^