04 control

Question 1

Transfers to a specific location in the program denoted with a program label without evaluating any condition.

Answer 1

Unconditional Control Transfer

jmp <label></label>

Question 2

The target or a location to jump to for control statements.

Starts with a letter, followed by letters, numbers, or “_”, terminated with a colon (“:”).

Answer 2

label (program label)

Question 3

True or False:

Labels may be defined only once.

Answer 3

True

Question 4

Control transfer instruction that provides a conditional jump based on a comparison.

This provides the functionality of a basic IF statement.

Answer 4

Conditional Control Transfer (jae, jbe, ja, jb, etc.)

Question 5

Two steps that are required for a comparison

Answer 5

compare instruction
&
conditional jump instruction

Question 6

True or False:

The conditional jump instruction always jumps to the provided label regardless of the result of the previous comparison or condition.

Answer 6

False

(will or will not jump)

Question 7

What is the general form of the compare instruction?

Answer 7

cmp <op1>, <op2></op2></op1>

Question 8

True or False:

<op1> can be an immediate value, but
<op2> may not be an immediate value
</op2></op1>

Answer 8

False

(Should always be cmp eax, 10 or cmp ebx, ecx)

cmp 10, eax (INVALID)

Question 9

True or False:

The conditional jump instruction is based only on the values of general-purpose registers, not the rFlag register.

Answer 9

False

(based on the contents of the rFlag register) (CF,ZF,SF,OF, etc.)

Question 10

Convert to Assembly:
num db 3
max db 8

if (num > max)
max = num

Answer 10

num db 3
max db 8

mov al, byte[num]
cmp al, byte[max]
jg newMax

newMax:
mov byte[max], al

Question 11

Convert to Assembly:

if ((ax >= 100) && (ax <= 120)){
bx = ax;
}else {
bx = cx;
}

Answer 11

cmp ax, 100
jl else_stmt
cmp ax, 120
jg else_stmt
mov bx, ax