[CSI] scoping of variables in loops

[Mikhail Nesterenko]

CSI students,

The scope of a variable in a block is this block. While-expression
lies outside the block and, hence, the variable declared inside the
block is out-of-scope in the expression.  That is:

      do{
	 int i = 0; // declared inside the block
	 ++i;
	 cout << i;
      }while (i < 10); // accessed outside the block

does not compile. The only exception is a loop variable of for-loop
which is declared outside the for-loop block yet whose scope is the
for-loop block. So the below statement compiles:

     for(int i=0; i < 10; ++i){
     	cout << i;
     }

Thanks,
-- 
Mikhail