Reviewing Concepts: Sussin' Out Time Portals

Program loaded.

run

[Switching to process 1280]

Running…

Portal Pilot: Engineering Log for Common Era 99.921 

TimePortal count is 1

TimePortal count is 2

....

 Portal Pilots has identified 2 new Time Portals in the Common Era

Debugger stopped.

Program exited with status value:0.

------------------

#import <stdio.h>

#import <Foundation/NSObject.h>

// Based on Page 110 ClassVariables2 and use of 'self'keyword

//  

// Portal Pilots are always searching for new Time Portals

//

// 

@interface TimePortal:NSObject

static int count;

+(int) getCount;

@end

//METHODS

@implementation TimePortal

-(TimePortal*) init

{

// (p 136) The 'super' keyword alows me to access the base class

// super = superclass = base class .... the class from which my

//     class TimePortal inherits or derives functionality

//     (p 119) This inheritance can include methods from the superclass

//  QUESTION I thought that a class could make use of ivars in the

//     super class too. But am not finding that this minute. CHECK BACK

// Here I'm using a constructor from the superclass to initialize the

//      data in an object when I create it (p 97)

//    Contructors are very typically called 'init'

//    The superclass for 'TimePortal' is 'NSObject'

self = [super init];

count++;

// A constructor returns a pointer to the object. 

// I get the pointer by calling the super class's init method. (p 97)

return self;

}

+(int) getCount

{

return count;

}

@end

int main (void) {

// Would LOVe to know how to display the SYSTEM DATE here

// It must be a keyword

// Look in the C++ Book

printf("Portal Pilot: Engineering Log for Common Era 99.921 \n");

    TimePortal *tp1 = [TimePortal new];

printf("TimePortal count is %i\n", [TimePortal getCount]);

TimePortal *tp2 = [TimePortal new];

printf("TimePortal count is %i\n", [TimePortal getCount]);

printf("\t....\n Portal Pilots has identified %i new Time Portals in the Common Era\n ", [TimePortal getCount]);

return 0;

}