View Compilation Error

0_0_16421057_6635.cpp: In function 'int main()':
0_0_16421057_6635.cpp:6:5: error: 'cin' was not declared in this scope
     cin>>T;
     ^
0_0_16421057_6635.cpp:11:9: error: 'cout' was not declared in this scope
         cout<<"Case #"<<cas<<": ";
         ^
0_0_16421057_6635.cpp:24:29: error: 'endl' was not declared in this scope
             cout<<"Yuwgna"<<endl;
                             ^
0_0_16421057_6635.cpp:26:27: error: 'endl' was not declared in this scope
             cout<<"Iaka"<<endl;
                           ^