View Compilation Error

0_0_30144227_25030.cpp: In function 'int main()':
0_0_30144227_25030.cpp:7:8: error: 'cin' was not declared in this scope
  while(cin)
        ^
0_0_30144227_25030.cpp:13:9: error: 'cout' was not declared in this scope
         cout<<chu<<endl;
         ^
0_0_30144227_25030.cpp:13:20: error: 'endl' was not declared in this scope
         cout<<chu<<endl;
                    ^