# of Elements in Array

Code:

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int array[] = { 1, 2, 3, 4, 5 };
int* ptr = array;
int size1 = sizeof( array ) / sizeof( int);
int size2 = sizeof( ptr ) / sizeof(int);

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size2 != size1.

I know why they are different from technical point of view, but why should they behave differently ?

sizeof(array); returns the size of the array, which means sizeof(int) * NrOfElements (basically 4*5=20)
sizeof(ptr); returns the size of a pointer, not what it's pointing to (basically 4)