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Exercise 13-7 ? undefined behavior???
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Topic: Exercise 13-7 ? undefined behavior??? (Read 2299 times)
mdeh
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Posts: 166
Exercise 13-7 ? undefined behavior???
«
on:
February 01, 2009, 06:38:15 AM »
Steve,
Although NSString is not yet formally covered, I wonder about the one definition given in the exercise ie
NSString *format = "x = %i";
It produces a warning on my : warning: initialization from incompatible pointer type
I **think**?? this is expected, as this assigns a C type string whereas an NSString type is expected? Is this the realm of undefined behavior and can any output from this be valid, even though it **does** seem to produce the expected result? SEE BELOW
It is not further used in the exercise, although the statement
"NSLog(@"%s", format);" seems to be accepted by the compiler (output: x = %i)
Also note, the integer x is unused in the exercise.
«
Last Edit: February 01, 2009, 08:15:14 AM by mdeh
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skochan
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Posts: 3114
Re: Exercise 13-7 ? undefined behavior???
«
Reply #1 on:
February 03, 2009, 06:10:43 AM »
Quote
Although NSString is not yet formally covered, I wonder about the one definition given in the exercise ie
NSString *format = "x = %i";
It produces a warning on my : warning: initialization from incompatible pointer type
Yes, that line should be deleted from the exercise (and it's incorrect to boot!).
«
Last Edit: February 03, 2009, 12:39:11 PM by skochan
»
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