View Compilation Error

0_0_33218736_21892.cpp: In function 'int main()':
0_0_33218736_21892.cpp:4:8: error: 'cin' was not declared in this scope
  while(cin>>n>>u>>d&&n!=0)
        ^
0_0_33218736_21892.cpp:11:3: error: 'cout' was not declared in this scope
   cout<<t<<endl;
   ^
0_0_33218736_21892.cpp:11:12: error: 'endl' was not declared in this scope
   cout<<t<<endl;
            ^
0_0_33218736_21892.cpp:13:16: error: 'system' was not declared in this scope
  system("pause");
                ^