Declare an object inside or outside a loop?

Question

Is there any performance penalty for the following code snippet?

for (int i=0; i         


        

Answer 1

The first makes far more sense. It keeps the variable in the scope that it is used in. and prevents values assigned in one iteration being used in a later iteration, this is more defensive.

The former is sometimes said to be more efficient but any reasonable compiler should be able to optimise it to be exactly the same as the latter.