Thanks to everyone who answered me. I appreciate your effort.
-M
Am 08.03.2010 um 23:16 schrieb Ed Wynne:

> 
> On Mar 8, 2010, at 4:55 PM, Nick Zitzmann wrote:
>> On Mar 7, 2010, at 5:07 PM, Marx Bievor wrote:
>> 
>>> I can substitute a String with %@ and an int with %d... like in return @"Hi 
>>> I am %@ and %d years old", name, age;
>>> what is the right command to substitute a bool and a float? I cannot find 
>>> any reference at apple's docs.
>> 
>> You generally want to use %f for floats and doubles. An ObjC BOOL is a 
>> signed 8-bit character type, so %hhd ought to work.
> 
> A much better and future-proof (translation: more paranoid) strategy with 
> printf-style format strings, as used by NSString, is to explicitly upcast 
> integer parameters to known compatible types. Ie., for a BOOL or any other 
> type of signed integer use "%d",(int)value instead of relying %hhd that is 
> specific to today's types. Tomorrow when BOOL is changed in some way, the 
> upcast will still work and be just as correct.
> 
> -Ed
> 

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