they provide a way for two way communication between functions

their scope extends from the point of definition through the remainder of the program

if they are not initialized, they will be initialised to zero

All of the above

address is the numeric value associated with a memory location

two variables can have the same address

value of a variable can be an address

All of the above

x is a four digit integer

x cannot be greater than a four digit integer

x is a four-bit integer

none of above

is set to null

becomes unpredictable

is set to 1

remains the same

enum is a data type

enum feature is an alternative to the define feature

In the same enumeration values must be distinct

Both enum is a data type and enum feature is an alternative to the define feature