External Data

Question 1

What are the variable types in C?

Answer 1

Local, global, static

Question 2

What is the scope and lifetime of a static variable?

Answer 2

Scope: local to the block of code that declares it
Lifetime: Life of the block of code

Question 2

What is the scope and lifetime of global variables?

Answer 2

Scope: global
Lifetime: Life of the program

Question 3

What is the scope and lifetime of static local variables?

Answer 3

Scope: Block of code where declared
Lifetime: Life of the program
Persist from call to call of the
function

Question 3

What is the scope and lifetime of static global variables?

Answer 3

Scope: local to file
Lifetime: life of program

Question 3

What are the characteristics of the .text section?

Answer 3

Contains: Program text(machine code), programmer initialized data
The .text section is read-only memory

Question 3

What is the difference between a global and a static variable?

Answer 3

Global variables can be accessed by other files. Static variable are private to where they are declared.

Question 4

What are the characteristics of the .data section

Answer 4

Contains: programmer initialized data
The .data section contains read/write memory

Question 4

What are the characteristics of the .bss(block starting by symbol) section?

Answer 4

Contains: zero-initialized data
The .bss section is read/write memory.
Located in low memory, just after section reserved for OS kernel.

Question 4

What data section are constants stored into?

Answer 4

.text section

Question 4

(T/F) .bss section only used the .skip pseudo-op

Answer 4

True

Question 5

What are the 2 ways to denote character constants?

Answer 5

Character can be denoted with their hex code(ASCII) or by the character in single quotes

Question 6

(T/F) A string literal is a read-only array of characters, allocated in the text section

Answer 6

True