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iOS Objective-C Basics (Retired) Pointers and Memory Array Size and Length

My code compiles fine locally but is not passing.

float real_numbers[5]; printf("Array real_numbers can store %ld items.", (int)(sizeof(real_numbers)/sizeof(float)));

array_length.mm
float real_numbers[5];
printf("Array real_numbers can store %ld items.", (int)(sizeof(real_numbers)/sizeof(float)));