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C Language - Storage Classes

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19.

Which storage class specifies global variables ?

A.	extern	B.	external static
C.	options a and b	D.	typedef

20.

External variable declaration uses

A.	the keyword external	B.	the keyword extern
C.	no keyword such as extern or external	D.	the keyword register

21.

External variable outside definition

A.	is specified outside definition	B.	reserves memory for storage
C.	is defined only once	D.	all the above

22.

What does extern means in a function declaration ?

A.	The function has global scope.	B.	The function need not be defined.
C.	Nothing really.	D.	The function has local scope only to the file it is defined in.

23.

External variable definition uses

A.	the keyword external	B.	the keyword extern
C.	no keyword	D.	the keyword auto

24.

External variable requires

A.	declaration	B.	definition
C.	options a and b	D.	initialization only

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