Block variables

Block variables are declared between the open and closing braces of Selection , Iteration Statements. 
such as for loops , if statement.. etc
Simply that means block variable only can use within a block.

Block Local variables are not accessible from the rest of the class.
As a example if you declared a variable called i in the if statement you cannot access  that variable from out of the if statement.

Compiler tells you that it cannot find variable i


important


Block variables also do not have any default values and also it cannot use without initializing.


(Try yourself to use block variable without been initialized)