Difference in coding style [duplicate]

Question

Is there any significant difference between following code:

for(int i=0;i<100;i++){
   int s =i;
}

and

int s=0;
for(int i=0;i<100;i++){
   s =i;
}

Answer 1

Is there any significant difference between following code:

Just the difference of scope of int s. In former, it would not be visible outside the for loop. Whereas, it would be in the later case. As far as best practices is concerned, you should try to minimize the scope of local variables as far as possible. So, if you are not using int s outside the for loop, then it's better to declare it inside only.