Pointers on Objective-c

Question

From what I understand (and please correct me if I\'m wrong):

int x, count = 10;
int *hello;
hello = &count;
x = *hello;

Here the varia

Answer 1

All the usage of objects in objective c is done through object references, e.g. pointers.

• The Objective C syntax lets you treat objects without dereferencing them, this is different than C / C++ for that matter.
• str is an object reference of type NSString (as myFraction) and @"Programming can be a headache" is an object reference of type NSString as well, so you can assign it to str.

Answer 2

Additional to Binyamin

• Everything inside the brackets [ ] is objective-C and not simple C (so [*object message] is not common to use)
• [object message], you send the "message" to your object, and the object responds with something (he can return something or he can do something without anything in return).
• Everything with a * on the left is pointer. So *str is a pointer. And where is it point? to an object NSString. The @"blabla" returns the adress of one CONSTANT string that has generated directly by the compiler.
• NSLog (@"%@\n", str); here the %@ calls the +Description class method of NSString object called str. By default the description of an NSString Object returns the value of the string (the text). %@ is not a simple replace like the %d with numbers (int,double etc). All objects have +Description method that inherit from the NSObject (note is Class method and not instant).

description

Returns a string that represents the contents of the receiving class.

• (NSString *)description