View Compilation Error

0_0_25976098_4552.cpp:1:15: error: 'cin' in namespace 'std' does not name a type
  int a,b;std::cin>>a>>b;std::cout<<a+b<<std::endl;
               ^
0_0_25976098_4552.cpp:1:30: error: 'cout' in namespace 'std' does not name a type
  int a,b;std::cin>>a>>b;std::cout<<a+b<<std::endl;
                              ^