View Compilation Error

0_0_28979538_10574.cpp: In function 'int main()':
0_0_28979538_10574.cpp:6:11: error: 'cin' was not declared in this scope
    while (cin>>a>>b) 
           ^
0_0_28979538_10574.cpp:7:4: error: 'cout' was not declared in this scope
    cout<<a+b<<endl; 
    ^
0_0_28979538_10574.cpp:7:15: error: 'endl' was not declared in this scope
    cout<<a+b<<endl; 
               ^