These are identical. It is a pointer in both cases. So I guess it may be more clear to write it as a pointer. The second case might cause beginners to think that you are passing an entire array by...

wow.

what did you expect that code to do?

if you want a dynamic array, which has a finite size that grows and shrinks as you add or remove elements, take a look at std::vector

yes. (except that in Java the first object is garbage-collected and in C++ it isn't)

attribute[] attr=new attribute[no_of_attribute];
attr has no_of_attribute arguments
for(int i=0;i<no_of_entity;i++){
i goes from 0 to no_of_entity
for(int j=0;j<no_of_attribute;j++){
j goes...