C pointers

[The coder]

I would like to ask about some expressions in c pointers


This is the example I will ask about with the output
http://xm.tl/a1084766

I want to understand each line meaning and why it print this output in each line

I'll be thankful for anyone help me because I'm very confused.

[GReaper]

If you know this, you can explain the lines easily:
Indirection and Address-of Operators

[Todd_65536]

In the code snippet you linked to, the variable named "i" is holding the integer number 3 in memory. Where that number is, for the most part, ain't important. Just assume it's located deep within the bowels of your computer. The variable "j" is holding yet another number someplace else in memory, except this time it's defined as an address-holder, a pointer to an integer. In this case, it is pointing to where the value of i is residing. Repeat the process for variable "k". It's simply another variable holding a number which this time, points to a pointer, a **.

Those little stars preceding the variable name within the definitions specify the variable's type. Those same stars also fetch what's inside the spot in memory that the variable is pointing to. The more stars you have before it, the deeper it digs. The ampersand symbol "&" simply returns the address of the variable itself.

I'll write-up an example using mailboxes if this isn't clear enough.

[The coder]

If you know this, you can explain the lines easily:
Indirection and Address-of Operators

It is very good book, I am working on it now, But there is another Question

http://xm.tl/a1084922

In this program, Why i dies when the control exit the function?

Thank you

[GReaper]

In this program, Why i dies when the control exit the function?

Because you return the address of a temporary variable, which "doesn't exist" after the function ends.

[The coder]

Because you return the address of a temporary variable, which "doesn't exist" after the function ends.

Thank you very much GReaper

The last Question and I'll be thankful <3

http://xm.tl/a1084993

Why this program did not print 7.0000 ? like c++

[GReaper]

"%f" expects a float or double, you give it an int. It doesn't know what to do with it.