Csci2450 Ch 3 Review Questions

Front 1

Identify valid suffix characters used in integer constants.

Back 1

h, q, o, d, b, r, t, y.

Front 2

Is A5h a valid hexadecimal constant?

Back 2

No a leading zero is required. (0A5h)

Front 3

Does the multiplication operator (*) have higher precedance than the division operator (/) in integer expressions?

Back 3

No (they have the same precedence)

Front 4

Write a constant experession that divides 10 by 3 and returns the integer remainder.

Back 4

10 MOD 3

Front 5

Show an example of a valid real number constant with an exponent.

Back 5

+3.4E-02

Front 6

Must string constants be enclosed in single quotes?

Back 6

No they can also be enclosed in double quotes.

Front 7

Reserved words can be instruction mnemonics, attributes, operators, predefined symbols, and _______

Back 7

directives (.code, .data, .stack)

Front 8

What is the maximum length of an identifier?

Back 8

247 characters

Front 9

T/F. An identifier cannot begin with a numeric digit.

Back 9

True

Front 10

T/F. Asssembly language identifiers are (by default) case sensitive.

Back 10

True

Front 11

T/F. Assembler directives execute at runtime.

Back 11

False

Front 12

T/F. Assembler directives can be written in any combination of upper and lowercase letters.

Back 12

True

Front 13

Name the four basic parts of an assembly language instruction.

Back 13

Label, mnemonic ,operand(s), comment.

Front 14

T/F. MOV is an example of an instruction mnemonic.

Back 14

True

Front 15

T/F. A code label is followed by a colon(:), but a data label does not have a colon.

Back 15

True

Front 16

Show an example of a block comment.

Back 16

Comment !
This is a comment
This is also a comment
!

Front 17

Why would it not be a good idea to use numberic addresses when writing instructions that access variable?

Back 17

Because the addresses coded in the instructions would have to be updated whenever new variables were inserted before existing ones.

Front 18

Create an uninitialized data declartion for a 16-bit signed integer.

Back 18

var1 SWORD ?

Front 19

Create an uninitialized data declartion for a 16-bit signed integer.

Back 19

var1 SWORD ?

Front 20

Create an uninitialized data declaration for an 8-bit unsigned integer.

Back 20

var2 BYTE ?

Front 21

Create an uninitialized data declaration for an 8-bit signed integer.

Back 21

var3 SBYTE ?

Front 22

Create an uninitialized data declaration for an 8-bit unsigned integer.

Back 22

var2 BYTE ?

Front 23

Create an uninitialized data declaration for a 64-bit integer.

Back 23

var4 QWORD ?

Front 24

Create an uninitialized data declaration for an 8-bit signed integer.

Back 24

var3 SBYTE ?

Front 25

Which data type can hold a 32-bit signed integer?

Back 25

SDWORD

Front 26

Create an uninitialized data declaration for a 64-bit integer.

Back 26

var4 QWORD ?

Front 27

Declare a 32-bit signed integer variable and initialize it with the smallest possible negative decimal value.

Back 27

var5 SDWORD -2147483648

Front 28

Which data type can hold a 32-bit signed integer?

Back 28

SDWORD

Front 29

Declare an unsigned 16-bit integer variable named wArray that uses three initializers.

Back 29

wArray WORD 10,20,30

Front 30

Declare a 32-bit signed integer variable and initialize it with the smallest possible negative decimal value.

Back 30

var5 SDWORD -2147483648

Front 31

Declare a string variable containing the name of your favorite color. Initialize it as a null-terminated string.

Back 31

myColor BYTE "blue", 0

Front 32

Declare an unsigned 16-bit integer variable named wArray that uses three initializers.

Back 32

wArray WORD 10,20,30

Front 33

Declare an uninitialized array of 50 unsigned doublewords named dArray.

Back 33

dArray DWORD 50 DUP(?)

Front 34

Declare a string variable containing the name of your favorite color. Initialize it as a null-terminated string.

Back 34

myColor BYTE "blue", 0

Front 35

Declare a string variable containing the word "TEST" repeated 500 times.

Back 35

myTestString BYTE 500 DUP("Test")

Front 36

Declare an uninitialized array of 50 unsigned doublewords named dArray.

Back 36

dArray DWORD 50 DUP(?)

Front 37

Declare a string variable containing the word "TEST" repeated 500 times.

Back 37

myTestString BYTE 500 DUP("Test")

Front 38

Declare an array of 20 unsigned bytes name bArray and initialize all elements to zero.

Back 38

bArray BYTE 20 DUP(0)

Front 39

Show the order of inidividual bytes in memory (lowest to highest) for the follow double word variable:
val1 DWORD 87654321h

Back 39

21h, 43h, 65h, 87h

Front 40

Write a statement that causes the assembler to calculate the number of bytes in the following array, and assign the value to a symbolic constant named ArraySize:
myArray WORD 20 DUP(?)

Back 40

ArraySize = ($ - myArray)

Front 41

Show how to calculate the number of elements in the following array, and assign the value to a symbolic constant named ArraySize:
myArray DWORD 30 DUP(?)

Back 41

ArraySize = ($ - myArray) / 4
4 because of type DWORD (4 bytes)