src.cpp:5:2: error: expected constructor, destructor, or type conversion before 'cin'
cin >>a;
^
src.cpp:6:2: error: 'cin' does not name a type
cin >>b;
^
src.cpp:7:3: error: 'cout' does not name a type
cout << a*b <<endl;
^
src.cpp:8:3: error: 'cout' does not name a type
cout << a+b;{
^
src.cpp:8:15: error: expected unqualified-id before '{' token
cout << a+b;{
^