Question about pointers (more may very well follow ;-|)

Question

I am reading a textbook about c++. The author describes how we declare and define a pointer *px to x, then he says we call function f like this: f(&x).

Why is the adress handed over directly when we went out of our way to create a pointer? Why don't we pass the pointer we made?

Or why don't we just always write the adress and not initialize pointers at all?

Answer 1

HonFu it's like you call a function summation(1,2) directly rather than doing as below :
int a = 1;
int b = 2;
summation(a,b);

to conclude, you can define pointer as address of variable and use pointer or direct address as argument to function...

I hope I made it clear.. if you have query, feel free to ask

Answer 2

yup

Answer 3

Ah, I think, I got you!

So I can store an address in a pointer. I can do it (for whatever reason) in my main program, but I am also doing it when I'm cbr-ing a function.

The pointer-vessel is waiting there in the shape of *px, and I fill this vessel with the call f(&x); I could also choose to pass px, if I had that pointer defined in my main, but that would basically be the same thing as handing over &x.

Answer 4

Ha - perfect. :)

Thanks!