Using The Same Name Again

Refer to the function named "head2". It contains another definition of the variable named "count". Even though "count" has already been defined as a global variable, it is perfectly all right to reuse the name in this function. It is a completely new variable that has nothing to do with the global variable of the same name, and causes the global variable to be unavailable in this function. This allows you to write programs using existing functions without worrying about the variables that interface with the functions