Question

Area(): length(5), breadth(2) { }

I see this used in c++ often. why did they put length(5) not length = 5, and is it the same thing just in a different method?

Answer 1

There are two types of initialisation of constructors

1)member initialisation

Area():length(5),breath(5)

2) assignment initialisation

Area()

{

length=5;

breath=5;

}

But first method is preferred due to its better performance because in first method there is direct initialisation whereas in second case compiler makes a copy of object.