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In C, is there a difference between the following declarations:
float DoSomething( const float arr[] );
Vs.
float DoSomething( const float* arr );
Is one preferable than the other?
No, there isn’t any difference. An array is decayed into a pointer whenever it is passed as an argument to a function.
I think that using the array syntax is a bit clearer, it gives a hint that it is an array and not just a pointer to one object.
There is a quite detailed description of pointers and arrays at http://www.c-faq.com/aryptr/index.html.