Storage Classes in c

What does a storage class define?

• Shape of a variable

• Scope, visibility, and lifetime of a variable

• Color of a variable

• Size of a variable

What does the scope of a variable determine?

• The color of a variable

• The period during which a variable retains a given value

• The availability of a variable for use in the program

• The weight of a variable

What is the extent of an object?

• The size of an object

• The period of time that its storage is allocated

• The color of an object

• The weight of an object

Which storage class has local extent and is deallocated on block/function exit?

• Static

• Register

• Extern

• Auto

What is the default initial value for automatic variables?

• Zero

• Garbage value

• One

• Random value

Where are external variables declared?

• In the CPU register

• At the beginning of a block

• Outside any function

• Inside a function

What happens if a local variable and a global variable have the same name?

• The global variable takes precedence

• The local variable takes precedence

• Both variables are deleted

• An error occurs

What is the purpose of the extern keyword?

• To declare global variables

• To initialize variables

• To declare local variables

• To delete variables

What is the scope of an extern variable?

• Function level

• Global

• Block level

• Local

What is the life of an extern variable?

• Till the end of the function

• Till the end of the file

• Till the end of the program execution

• Till the end of the block