./test.cpp: In function 'int main()':
./test.cpp:3:5: error: 'cin' was not declared in this scope
cin >> a >> b;
^
./test.cpp:6:2: error: 'cout' was not declared in this scope
cout<<a+b<<endl;
^
./test.cpp:6:13: error: 'endl' was not declared in this scope
cout<<a+b<<endl;
^