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05.03.2008 at 01:39PM PDT, ID: 23374240
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6.6

Xcode link error: ".objc_class_name_Object"

Asked by Attabui in Apple Programming, Objective-C Programming Language, Cocoa Programming Language

Tags:

I've recently begun learning Objective-C.  This code snippet (attached) was provided as a part of the learning exercises in Stephen Kochan's book, Programming in Objective-C.  I've pasted this code in to Xcode, and am having trouble understanding why it won't compile.  Xcode's linker is complaining about my use of the Object superclass and something else about messaging - see the attached image for the errors.

Any assistance would be appreciated!

~MikeyStart Free Trial 
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// Program to access instance variables  contd
 
#import <stdio.h>
#import <objc/Object.h>
 
//------- @interface section -------
 
@interface  Fraction: Object
{
	int	numerator;
	int	denominator;
}
 
-(void)  print;
-(void)  setNumerator: (int) n;
-(void)  setDenominator: (int) d;
-(int)   numerator;
-(int)   denominator;
 
@end
 
//------- @implementation section -------
 
 
@implementation Fraction;
-(void) print 
{
	printf (" %i/%i ", numerator, denominator);
}
 
-(void) setNumerator: (int) n
{
	numerator = n;
}
 
-(void) setDenominator: (int) d
{
	denominator = d;
}
 
-(int) numerator 
{
	return numerator;
}
 
-(int) denominator
{
	return denominator;
}
 
@end
 
 
//------- program section -------
 
int main (int argc, char *argv[])
{
	Fraction	*myFraction = [[Fraction alloc] init]; 
 
	// Set fraction to 1/3 
 
	[myFraction setNumerator: 1];		
	[myFraction setDenominator: 3];
 
	// Display the fraction using our two new methods
 
	printf ("The value of myFraction is: %i/%i\n",
	   [myFraction numerator], [myFraction denominator]);
 
	[myFraction free];
	return 0;
}
Attachments:
 
Picture-1.png (91 KB) (File Type Details) 
Xcode linker errors
Xcode linker errors
 
[+][-]05.03.2008 at 02:51PM PDT, ID: 21493793

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[+][-]05.03.2008 at 03:21PM PDT, ID: 21493865

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About this solution

Zones: Apple Programming, Objective-C Programming Language, Cocoa Programming Language
Tags: Objective-C
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Solution Provided By: Attabui
Participating Experts: 0
Solution Grade: A
 
 
 
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