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iOS Objective-C Basics (Retired) Pointers and Memory Structs

Why is it c and not *c when calling the make Sphere function in the main()?

I think I understand why it's *c when used in declaring and implementing the function makeSphere. (Because it's passing an array to a function?)

But when calling the function in the main(), I get the error message "Passing 'float' to parameter of incompatible type 'float', if I try passing *c. And I'm not understanding what this means. And why does it need to be just c?

Thank you!