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Objective-C beginner question
From: |
Michael Thaler |
Subject: |
Objective-C beginner question |
Date: |
Thu, 9 Mar 2006 15:10:28 +0100 |
User-agent: |
KMail/1.7.2 |
Hi,
I am new to Objective-C. I tried to compile one of the examples of Kochan's
book "Programming in Objective-C":
#import <stdio.h>
#import <objc/Object.h>
@interface Fraction: Object
{
int numerator;
int denominator;
}
-(void) print;
-(void) setNumerator: (int) n;
-(void) setDenominator: (int) d;
@end
@implementation Fraction;
-(void) print
{
printf(" %i/%i ", numerator, denominator);
}
-(void) setNumerator: (int) n
{
numerator = n;
}
-(void) setDenominator: (int) d
{
denominator = d;
}
@end;
int main(int argc, char *argv[])
{
Fraction *myFraction;
myFraction = [Fraction alloc];
myFraction = [Fraction init];
[myFraction setNumerator: 1];
[myFraction setDenominator: 3];
printf("The value of myFraction is: ");
[myFraction print];
printf("\n");
[myFraction free];
}
It compiles fine (I compiled it with gcc-3.4 fraction_class.m -o
fraction_class -l objc), but when I run the program, I get
./fraction_class
error: Fraction (class)
Fraction does not recognize setNumerator:
Aborted
The system is Debian Sarge with gcc 3.4 (also happens with gcc 3.3).
Can someone tell me what I am doing wrong here?
Greetings,
Michael
- Objective-C beginner question,
Michael Thaler <=