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POFollowup on: Difference between class methods and instance methods?
 

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  1. POFollowup on: Difference between class methods and instance methods?
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    <p>This is a followup question to (user) micmoo's response on <a href="https://stackoverflow.com/questions/1053592/objective-c-class-vs-instance-methods">What is the difference between class and instance methods?</a> .</p> <p>If I change the variable: numberOfPeople from static to a local variable in the class, I get numberOfPeople as 0. I have also added a line to show the numberOfPeople after the variable has been incremented each time. Just to avoid any confusion, my code is as follows:</p> <pre><code>// Diffrentiating between class method and instance method #import &lt;Foundation/Foundation.h&gt; // static int numberOfPeople = 0; @interface MNPerson : NSObject { int age; //instance variable int numberOfPeople; } + (int)population; //class method. Returns how many people have been made. - (id)init; //instance. Constructs object, increments numberOfPeople by one. - (int)age; //instance. returns the person age @end @implementation MNPerson int numberOfPeople = 0; - (id)init{ if (self = [super init]){ numberOfPeople++; NSLog(@"Number of people = %i", numberOfPeople); age = 0; } return self; } + (int)population{ return numberOfPeople; } - (int)age{ return age; } @end int main(int argc, const char *argv[]) { @autoreleasepool { MNPerson *micmoo = [[MNPerson alloc] init]; MNPerson *jon = [[MNPerson alloc] init]; NSLog(@"Age: %d",[micmoo age]); NSLog(@"Number Of people: %d",[MNPerson population]); } } </code></pre> <p>Output:</p> <p>In init block. Number of people = 1 In init block. Number of people = 1 Age: 0 Number Of people: 0</p> <p>Case 2: If you change the numberOfPeople in the implementation to 5 (say). The output still does not make sense.</p> <p>Thank you in advance for your help.</p>
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    1. USRutvij Kotecha
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      1. POFollowup on: Difference between class methods and instance methods?
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    1. COYou're not changing the type, you're creating a new variable.
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      1. POFollowup on: Difference between class methods and instance methods?
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    2. COThanks a lot Dustin!
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      1. POFollowup on: Difference between class methods and instance methods?
      1. USRutvij Kotecha
 

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