View Compilation Error

0_0_37910026_16222.cpp: In function 'int main()':
0_0_37910026_16222.cpp:8:5: error: 'cin' was not declared in this scope
     cin>>T;
     ^
0_0_37910026_16222.cpp:15:13: error: 'cout' was not declared in this scope
             cout<<"No solution!"<<endl;
             ^
0_0_37910026_16222.cpp:15:35: error: 'endl' was not declared in this scope
             cout<<"No solution!"<<endl;
                                   ^
0_0_37910026_16222.cpp:27:33: error: 'printf' was not declared in this scope
             printf("%.4lf\n",mid);
                                 ^