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iOS Objective-C Basics (Retired) Pointers and Memory Pointers

Posted by simondumalski
simondumalski
3,875 Points

Assign the variable "pointy" the address of "alpha".

I need help Assigning the variable "pointy" to the address of "alpha". My code is:

char *pointy;
char alpha = 'k';
*pointy = α
    ``` 
I think I'm correct but its wrong. Please Help.
Stephen Viramontes
Stephen Viramontes
330 Points

QUOTE: " *pointy = α I think I'm correct but its wrong. "

take out the pointer in 'pointy'. so it reads:

pointy = α

2 Answers

Matthew Mascioni
Matthew Mascioni
20,444 Points
Matthew Mascioni
Matthew Mascioni
20,444 Points

Hey!

Hmm... You seem to be doing everything right, but I think it might be a good idea to quickly review setting a variable vs. setting the value of it. In the first part of the challenge, you declared a pointer variable (of type char) named pointy. I'm going to declare one named 'theScore', of type int.

int *theScore;

Note that the asterisk (*) denotes the variable being a pointer.

Say I created another int named score, not initializing it. It would look like this:

int score;

However, if I wanted to set the value of score, I would use the = sign to accomplish this, like so:

score = 72;

(for once, I'm good at sports!)

Pointers work the exact same way. If I wanted to set the pointer theScore to the memory address of score:

theScore = &score;

We only use the asterisk (*) when declaring a new pointer. This becomes very prominent when you start working more with Objective-C. If I declared and initialized this, for example:

NSString *string = @"Hello!";

I'd change the value by doing this:

string = @"New value!";

Hope this helps!

simondumalski
simondumalski
3,875 Points
simondumalski
simondumalski
3,875 Points

Thank You for the answer! Helped out so much!