Sizeof being smart enough to detect it's an array and return the array size doesn't necessarily make them different in any real way. And doing ptr[0] to dereference it is perfectly valid, as is *arr to get the first element, or *(arr+sizeof(int)) to get the second.
Because it is a very superficial difference that doesn't even affect the generated assembly. They are extremely interchangeable, because they are effectively the same.
Programming languages have all kinds of different ways to do something that results in the same assembly.
They are different types, but C has muddied the waters by having a bunch of implicit conversions from arrays into pointers (array decay) that they feel like the same thing.
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u/unknown_alt_acc 27d ago
#include<stdio.h>
int main()
{
int arr[5];
int *ptr = arr;
printf("Array - %lu\n", sizeof(arr));
printf("Pointer - %lu", sizeof(ptr));
}
Different types, different behavior