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

This works on my Mac but not in you0r web session

int main(){
    float real_numbers[5];
    printf("Array real_numbers is %ld bytes.\n", sizeof(real_numbers));
    int size;
    size = sizeof(real_numbers)/sizeof(float);

    printf("Array real_numbers can store %ld bytes.\n", size);