different way of initializing variable?

hi,

i just read that you can initialize a variable

int num = 10;

like this

int num(10)

does any one ever do this ? are there any differences at all however subtle between the 2?

Thanks.

I do this as well.

int num = 10; <-- creates the variable, initializes with the default value, then assigns 10 to it.

int num(10); <-- creates the variable and initializes it with whatever's between the parentheses, using the constructor.

Quote:

---

Originally posted by The Gweech
hi,

i just read that you can initialize a variable

int num = 10;

like this

int num(10)

does any one ever do this ? are there any differences at all however subtle between the 2?

Thanks.

---

That's (parantheses) the standard way to initialize a programmer defined class object, at least as far as I've learned .
E.g., you create a class called Employee that contains first & last names & id #. When you create an object of class Employee, you can initialize it it like this:

Code:

---

Employee peon("Joe", "Sixpack", 666);

---

A class is like a built in type (int, double, char, etc). There are probably differences, but that's what I've learned so far.

There is actually no real difference in the two different syntaxes, but the parenthetical syntax is required in the initialization lists for class constructors:


class some_class
{
public:
some_class() : varone(1), // Parentheses used here
vartwo(2),
varthree(3)
{
// Initialize...
}
private:
int varone, vartwo, varthree;
};