Storage Classes

Question 1

What are “Storage Classes”?

Answer 1

used for memory management in C. allow the user to change the scope, visibility, and lifetime of a variable

Question 2

What are the properties of a variable in the “auto” storage class? (Declaration, Storage, Uninitialized Value, Scope, Lifetime)

Answer 2

• Declared inside a function
• Stored in memory
• Uninitialized yields garbage values
• Scope is within the function
• Lifetime is within the function

Question 3

What are the properties of a variable in the “static” storage class? (Declaration, Storage, Uninitialized Value, Scope, Lifetime)

Answer 3

• Declared inside a function
• Stored in memory
• Uninitialized yields 0 value
• Scope is within the function
• Lifetime is the program runtime

Question 4

What are the properties of a variable in the “register” storage class? (Declaration, Storage, Uninitialized Value, Scope, Lifetime)

Answer 4

• Declared inside a function
• Stored in CPU registers
• Uninitialized as garbage
• Scope is within the function
• Lifetime is within the function

Question 5

What are the properties of a variable in the “extern” storage class? (Declaration, Storage, Uninitialized Value, Scope, Lifetime)

Answer 5

• Declared outside all functions
• Stored in memory
• Uninitialized as 0 value
• Scope is global (across the whole program)
• Lifetime is the program runtime