Which one of the following is NOT a storage class in C ?

CONCEPT

In C, storage duration tells how long an object exists, whereas linkage tells whether declarations in different scopes or translation units denote the same entity. Traditional storage-class terminology includes automatic, register, static, and external classes; the corresponding specifiers govern lifetime, linkage, or both.

APPLICATION

• Automatic storage class: a block-scope object normally exists only while execution is within its block.

• Static storage class: the object exists for the full execution of the program.

• External storage class: an extern declaration can refer to an entity defined in another translation unit.

• Internal is linkage terminology, not a separate C storage class; file-scope static gives a name internal linkage.

CROSS-CHECK / CONTRAST

C provides the keyword static to give a file-scope name internal linkage; it does not provide an internal storage-class keyword. Therefore the value that is not a storage class is Internal storage class.