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iOS Objective-C Basics (Retired) Foundation Framework NSNumber

How do I declare the variable planck NSNumber with the value 6.626!!?

I've tried everything I can think of!!

4 Answers

Stone Preston
Stone Preston
42,016 Points

you need to use NSNumber literals. to assign an NSNumber literal you use the following syntax

NSNumber *someNumber = @25;

so to assign a literal to planck you would use:

NSNumber *planck = @6.626;
Rebecca Wei
Rebecca Wei
596 Points

It took me forever to get this as well!! It will actually only accept the second way it showed to assign the value from the previous video, the first and third ways don't work.

Ian Nebbiolo
Ian Nebbiolo
2,031 Points

Just had the same problem spent 5 minutes trying to workout why it didn't like my syntax before finding this forum post. Thank you :)

Ivan Kvyatkovskiy
Ivan Kvyatkovskiy
5,743 Points

NSNumber *planck = [[NSNumber alloc] initWithFloat:6.626];

Thanks but that's what I did and it's still telling me it's wrong.

Ivan Kvyatkovskiy
Ivan Kvyatkovskiy
5,743 Points

Seems like that Code Challenge wants some specific syntax from you that was presented in previous videos. Check them out and retry.