I've just started learning objective-c, from a book. I'm using Xcode to write it in. I've written in a piece of code that it told me to, but when I run it it displays this error message:
This is the code I have:
The only thing I could think of that may be the problem is the book was teaching objective-c 1.0, instead of 2.0, which I presume is what Xcode is using.
Could you please help?
This is the code I have:
Code:
// Program to work with fractions class version
#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;
@end
//------- @implementation section -------
@implementation Fraction;
-(void) print
{
printf (" %i/%i ", numerator, denominator);
}
-(void) setNumerator: (int) n
{
numerator = n;
}
-(void) setDenominator: (int) d
{
denominator = d;
}
@end
//------- program section -------
int main (int argc, char *argv[])
{
Fraction *myFraction;
// Create an instance of a Fraction
myFraction = [Fraction alloc];
myFraction = [myFraction init];
// Set fraction to 1/3
[myFraction setNumerator: 1];
[myFraction setDenominator: 3];
// Display the fraction using the print method
printf ("The value of myFraction is:");
[myFraction print];
printf ("\n");
[myFraction free];
return 0;
}The only thing I could think of that may be the problem is the book was teaching objective-c 1.0, instead of 2.0, which I presume is what Xcode is using.
Could you please help?
) and when doesNotRecognizeSelector is not found, the runtime aborts the program. 