Chapter 3 & 4

Question 1

Integer Operator Precedence

Answer 1

1. ()
2. +,- (unary)
3. *,/
4. MOD
5. +,-

Question 2

Directives

Answer 2

Commands that are recognized and acted upon by the assembler

• used to declare code, declare procedures

Question 3

Instructions

Answer 3

Assembled into machine code by assembler, executed at runtime by CPU

Contains: label (optional)
Mnemonic operant comment

Question 4

Labels

Answer 4

a) Data labels - ex: myArray

b) Code labels - ex: L1:

Question 5

Mnemonics

Answer 5

MOV, ADD, SUB, etc.

Question 6

Listing File

Answer 6

Shows how program is compiled. Contains:

• source code
• addresses
• object code (machine language)
• segment names
• symbols (variables, procedures, constants)

Question 7

BYTE, SBYTE

Answer 7

8-bit unsigned integer, 8-bit signed integer

Question 8

TBYTE

Answer 8

80-bit integer (10 bytes)

Question 9

Data Definition

Answer 9

Syntax:
[name] directive initializer

value1 DWORD 2

Question 10

CR/LF

Answer 10

Carriage return 0dh
Line feed 0ah

Ex: “hello”,0,dh,ah

Question 11

DUP Operator

Answer 11

Syntax: 
counter DUP (argument)

Question 12

Little Endian Order

Answer 12

All data types larger than a byte store their individual bytes in reverse order.

The least significant byte occurs at the first (lowest) memory address

Values read backwards

Question 13

Declaring Uninitialized Data

Answer 13

.data?

MyEx BYTE ?

Question 14

$

Answer 14

Current location counter

Question 15

EQU

Answer 15

Count = 3
Count EQU 3

Equivalent

Question 16

Operant Types

Answer 16

1. Immediate (constant integer)
2. Register
3. Memory

Question 17

MOV

Answer 17

Move source to destination

mov destination, source

Question 18

Zero extension

Answer 18

MOVZX

Question 19

Sign extension

Answer 19

MOVSX

Question 20

XCHG

Answer 20

Exchanges the values of 2 operands

Question 21

Direct-Offset Operands

Answer 21

A constant offset is added to a data label, producing an effective address

Ex: mov al, myArray+1

(Moves second element in byte array to al)

Question 22

TYPE Operator

Answer 22

Returns the size (in bytes) of a single element of a data declaration

Question 23

LENGTHOF Operator

Answer 23

Returns the number of elements in a single data declaration

Question 24

SIZEOF Operator

Answer 24

Returns TYPE * LENGTHOF

Question 25

LABEL Directive

Answer 25

Assigns an alternate label name and type to an existing storage location.

Does not allocate storage

Question 26

Indirect Operand

Answer 26

Holds the address of a variable (usually array or string)

Can be dereferenced

Ex:
mov esi, OFFSET var1
mov al, [esi]

Question 27

Pointer

Answer 27

Ex:
mov esi, OFFSET myCount
inc WORD PTR [esi]