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Official Forum for Programming in Objective-C (the iPhone Programming Language) - Stephen Kochan
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pg 474 and 475
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Topic: pg 474 and 475 (Read 1927 times)
drshock
Newbie
Posts: 1
pg 474 and 475
«
on:
November 04, 2011, 03:38:18 PM »
I just picked up the book, appears the latest - third edition second printing: August 2011.
The program 21.2 Fraction.m has an incomplete implementation printed for multiply and divide. For example my copy has this on pg 474
result.numerator = numerator * f.numerator
Obviously incomplete at this line. Divide has a similar issue going onto pg 475.
result.numerator = numerator * f.denominator
result.denominator = denominator * f.numerator];
FYI,
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Fred
Newbie
Posts: 46
Re: pg 474 and 475
«
Reply #1 on:
November 08, 2011, 07:36:43 AM »
I'm using the PDF version of the book and it is complete showing the following on the two pages (except for two missing semi-colons as indicated).
-(Fraction *) multiply: (Fraction *) f
{
Fraction *result = [[[Fraction alloc] init] autorelease];
result.numerator = numerator * f.numerator; // added missing semi-colon
result.denominator = denominator * f.denominator;
[result reduce];
return result;
}
-(Fraction *) divide: (Fraction *) f
{
Fraction *result = [[[Fraction alloc] init] autorelease];
result.numerator = numerator * f.denominator; // added missing semi-colon
result.denominator = denominator * f.numerator];
[result reduce];
return result;
}
the mathematical formulas are correct.
Of course for the above to work with ARC under Xcode 4.2 you must remove the autorelease portion of the variable declarations as in:
Fraction *result = [[Fraction alloc] init];
Hope this helps.
Fred
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Fred
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