​​Code-Block Level Scope

A variable declared within a loop or any block within brackets has the code-block level scope. A variable declared within a loop or code block cannot be accessed outside of it, whereas a variable declared outside of the loop can be accessible within the loop.

In the above example, a variable i declared within a for loop. So, it can only be accessed within the for loop block and cannot be accessed outside for loop. In the same way, x is declared within the if block, so it can only be accessed in that block but not outside of it.

A variable must be declared outside of the code block to make it accessible to outside code.

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