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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