The first allocates an array of struct and the other allocates an array of pointers to struct . In the first case, you can write to fields by assigning ptr0. Field1 = value right away, while in the second case you must allocate the struct itself before doing the actual writing.
The function malloc doesn't deal in structures or pointers. It only understands bytes. So the first allocates enough bytes for n struct test objects, which the second allocates enough space for n struct test * objects.
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