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Posted by Stu Cowley
Stu Cowley
26,287 Points

Objective-C Basics Code Challenge Issue

Hey guys

I've started doing the new Object-C basics series with Doug Turner and I've been stuck on the final part of the code challenge for Fundamentals of C - Variables I've added the two variables correctly in parts 1 & 2, but part 3 I'm stuck on. I've declared everything in what I think is correct as I have tested it out in Xcode with no problems.

Here is the question: Add a printf statement to print both variables. Here is what your output should look like: 6 balls each with a radius of 14.5 inches.

Here is the source in the final part of the question.

float radius = 14.5;
int count = 6;

printf ("%d balls each with a radius of ", balls);
printf ("%f inches", radius);

Here is the error that I get Make sure you are passing a string instead of a NSString to printf. Also, make sure you have the correct format options. %d is used for integers and %f is used for floats.

I just don't know what to make of this. Am I to do this in Object-C or in C?

Any help will be greatly appreciated, and I'll keep racking my brains to try and find the answer.

Thanks in advanced

Stu :)

7 Answers

Stephen Whitfield
Stephen Whitfield
16,771 Points
Stephen Whitfield
Stephen Whitfield
16,771 Points

Looks like you're printing those statements on two separate lines. They're asking for a single print statement. Just try fitting what you have in the second line of code into the first line of code and it should pass.

Amit Bijlani
STAFF
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

I have simplified the challenge given that the preceding video only shows you how to print one variable at a time.

Laurence Bowe
Laurence Bowe
6,222 Points
Laurence Bowe
Laurence Bowe
6,222 Points

Thanks for the suggestion Stephen though that didn't work for me?! PLZ HELP!

Stefan Bjornsson
Stefan Bjornsson
3,362 Points
Stefan Bjornsson
Stefan Bjornsson
3,362 Points

Im adding the printf() statement in task 2 for this challenge and Im not sure why this is not passing: float radius = 14.5; printf("%f A ball with a radius of 14.5 inches.\n", radius);

John W
John W
21,558 Points

You want the output to be "A ball with a radius of 14.5 inches.", but what you have right now will output "14.5 A ball with a radius of 14.5 inches." Remember, printf substitutes %f (or other %?) with the variable that follows the string after the comma.

John W
John W
21,558 Points
John W
John W
21,558 Points

Amit Bijlani, another issue with Obj-C code challenges. Stage 6 Memory Management task 1/3 asks for id something but the code validator wants id thing.

Stu Cowley
Stu Cowley
26,287 Points
Stu Cowley
Stu Cowley
26,287 Points

I'm finding the all the quiz challenges that make us fill in the blanks with the code are way too confusing, there has been times where I just sit there scratching my head and, these should be code challenges. I'm really enjoying C but I find I'm losing motivation to do it.

Stu Cowley
Stu Cowley
26,287 Points
Stu Cowley
Stu Cowley
26,287 Points

Hey Amit,

So I re-tried the quizzes after taking a days break from Treehouse and referring back to my notes and it makes a lot more sense now.

I think 9 hours straight 6 days in a row was over working my brain.

Stu :)