View Compilation Error

0_0_30054892_30351.cpp: In function 'int main()':
0_0_30054892_30351.cpp:7:2: error: 'cin' was not declared in this scope
  cin>>T;
  ^
0_0_30054892_30351.cpp:20:3: error: 'cout' was not declared in this scope
   cout<<(int)x<<" ";
   ^
0_0_30054892_30351.cpp:28:21: error: incomplete type 'std::ios {aka std::basic_ios<char>}' used in nested name specifier
   cout<<setiosflags(ios::fixed)<<setprecision(2)<<p<<endl;
                     ^
0_0_30054892_30351.cpp:28:54: error: 'endl' was not declared in this scope
   cout<<setiosflags(ios::fixed)<<setprecision(2)<<p<<endl;
                                                      ^