View Compilation Error

0_0_19169342_26341.cpp: In function 'int main()':
0_0_19169342_26341.cpp:5:8: error: 'cin' was not declared in this scope
  while(cin>>a>>b)          
        ^
0_0_19169342_26341.cpp:6:5: error: 'cout' was not declared in this scope
     cout<<a+b<<endl;
     ^
0_0_19169342_26341.cpp:6:16: error: 'endl' was not declared in this scope
     cout<<a+b<<endl;
                ^