Control Transfer Instruction

Question 1

What is the syntax for the unconditional control transfer instruction?

Answer 1

jmp <label></label>

Question 2

jmp transfers to a specific location in the program denoted with a program label without _____________________.

Answer 2

evaluating any condition

Question 3

A program _________ is the target, or a location to jump to, for control statements.

Answer 3

label

Question 4

A label starts with a letter, followed by letters, numbers, or _, terminated with a _.

Answer 4

underscore (_), colon (:)

Question 5

Labels may be defined only _.

Answer 5

once

Question 6

Conditional control transfer instructions provide a ______________ based on a comparison.

Answer 6

conditional jump

Question 7

A conditional jump is carried out on the basis of a _____ value

Answer 7

truth

Question 8

Two steps required for a comparison.

Answer 8

compare, conditional jump

Question 9

General form of the compare instruction?

Answer 9

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

Question 10

What are the restrictions on the compare instruction?

Answer 10

1. operands must of the same size and cannot be both variable.
2. only operand2 can be an immediate value

Question 11

The cmp instruction will compare two results and store the results of the comparison in the ________ register.

Answer 11

rFlag

Question 12

In conditional transfer instructions,
je means _____
jl means _____
jg means _____
ja means _____
jb means _____
jne means _____

Answer 12

je -> op1 == op2
jl -> op1 < op2
jg -> op1 > op2
ja -> op1 > op2
jb -> op1 < op2
jne -> op1 != op2

Question 13

What is the assembly code for this?
if (num > max){
max = num
}

Answer 13

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

newMax:
mov byte[max], al

Question 14

What is the assembly code for this?
if (num > max){
max = num
}else{
max = max
}

Answer 14

mov al, byte[num]
cmp al, byte[max]
jbe else
mov byte[max], al
else:

Question 15

Translate this code into assembly:
if (ax >= 100 && ax <= 120){
bx = ax
}else{
bx = cx

Answer 15

cmp ax, 100
jb elseStatement
cmp ax, 120
ja elseStatement
mov bx,ax
jmp SKIP

elseStatement:
mov bx, cx