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Assembly Quiz 3 – Flashcards

Steven Ramirez

7 July 2022

question

Identify valid suffix characters used in integer constants.

answer

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

question

Is A5h a valid hexadecimal constant?

answer

question

Does the multiplication operator * have a higher precedence than the division operator / in integer expressions?

answer

question

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

answer

Expression: 10 MOD 3.

question

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

answer

Real number constant: +3.5E-02.

question

Must string constants be enclosed in single quotes?

answer

No, they can also be enclosed in double quotes

question

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

answer

Directives

question

What is the maximum length of an identifier?

answer

247 characters

question

An identifier cannot begin with a numeric digit.

answer

True

question

Assembly language identifiers are (by default) case insensitive.

answer

True

question

Assembler directives execute at runtime.

answer

False

question

Assembler directives can be written in any combination of uppercase and lowercase letters.

answer

True

question

Name the four basic parts of an assembly language instruction.

answer

Label, mnemonic, operand(s), comment.

question

MOV is an example of an instruction mnemonic.

answer

True

question

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

answer

True

question

Show an example of a block comment.

answer

Code example: Comment ! This is a comment This is also a comment !

question

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

answer

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

question

In the AddSub program (Section 3.2), what is the meaning of the INCLUDE directive?

answer

The INCLUDE directive copies necessary definitions and setup information from the Irvine32.inc text file. The data from this file is inserted into the data stream read by the assembler.

question

In the AddSub program, what does the .CODE directive identify?

answer

Marks the beginning of the code segment.

question

What are the names of the segments in the AddSub program?

answer

code, data, and stack.

question

In the AddSub program, how are the CPU registers displayed?

answer

By calling the DumpRegs procedure.

question

In the AddSub program, which statement halts the program?

answer

The exit statement

question

Which directive begins a procedure?

answer

The PROC directive

question

Which directive ends a procedure?

answer

The ENDP directive

question

What is the purpose of the identifier in the END statement?

answer

It marks the last line of the program to be assembled, and the label next to END identifies the program's entry point (where execution begins).

question

What does the PROTO directive do?

answer

PROTO declares the name of a procedure that is called by the current program.

question

What types of files are produced by the assembler?

answer

Object .OBJ and listing .LST files.

question

The linker extracts assembled procedures from the link library and inserts them in the executable program.

answer

True

question

When a program's source code is modified, it must be assembled and linked again before it can be executed with the changes.

answer

True

question

Which operating system component reads and executes programs?

answer

Loader

question

What types of files is produced by the linker?

answer

Executable .EXE

question

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

answer

var1 SWORD ?

question

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

answer

var2 BYTE ?

question

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

answer

var3 SBYTE ?

question

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

answer

var4 QWORD ?

question

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

answer

SDWORD

question

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

answer

var5 SDWORD -2147483648

question

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

answer

wArray WORD 10, 20, 30

question

Declare a string variable containing the name of your favorite color. Initialize it as a nullterminated string.

answer

myColor BYTE "blue", 0

question

Declare an uninitialized array of 50 unsigned doublewords named dArray.

answer

dArray DWORD 50 DUP(?)

question

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

answer

myTestString BYTE 500 DUP("TEST")

question

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

answer

bArray BYTE 20 DUP(0)

question

Show the order of individual bytes in memory (lowest to highest) for the following doubleword variable: val1 DWORD 87654321h

answer

21h, 43h, 65h, 87h

question

Declare a symbolic constant using the equal-sign directive that contains the ASCII code (08h) for the Backspace key.

answer

BACKSPACE = 08h

question

Declare a symbolic constant named SecondsInDay using the equal-sign directive and assign it an arithmetic expression that calculates the number of seconds in a 24-hour period.

answer

SecondsInDay = 24 * 60 * 60

question

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(?)

answer

ArraySize = ($ - myArray)

question

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(?)

answer

ArraySize =($ - myArray) / TYPE DWORD

question

Use a TEXTEQU expression to redefine "PROC" as "PROCEDURE."

answer

PROCEDURE TEXTEQU

question

Use TEXTEQU to create a symbol named Sample for a string constant, and then use the symbol when defining a string variable named MyString.

answer

Code example: Sample TEXTEQU MyString BYTE Sample

question

Use TEXTEQU to assign the symbol SetupESI to the following line of code: mov esi,OFFSET myArray

answer

SetupESI TEXTEQU

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question

Identify valid suffix characters used in integer constants.

answer

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

question

Is A5h a valid hexadecimal constant?

answer

question

Does the multiplication operator * have a higher precedence than the division operator / in integer expressions?

answer

question

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

answer

Expression: 10 MOD 3.

question

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

answer

Real number constant: +3.5E-02.

question

Must string constants be enclosed in single quotes?

answer

No, they can also be enclosed in double quotes

question

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

answer

Directives

question

What is the maximum length of an identifier?

answer

247 characters

question

An identifier cannot begin with a numeric digit.

answer

True

question

Assembly language identifiers are (by default) case insensitive.

answer

True

question

Assembler directives execute at runtime.

answer

False

question

Assembler directives can be written in any combination of uppercase and lowercase letters.

answer

True

question

Name the four basic parts of an assembly language instruction.

answer

Label, mnemonic, operand(s), comment.

question

MOV is an example of an instruction mnemonic.

answer

True

question

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

answer

True

question

Show an example of a block comment.

answer

Code example: Comment ! This is a comment This is also a comment !

question

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

answer

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

question

In the AddSub program (Section 3.2), what is the meaning of the INCLUDE directive?

answer

The INCLUDE directive copies necessary definitions and setup information from the Irvine32.inc text file. The data from this file is inserted into the data stream read by the assembler.

question

In the AddSub program, what does the .CODE directive identify?

answer

Marks the beginning of the code segment.

question

What are the names of the segments in the AddSub program?

answer

code, data, and stack.

question

In the AddSub program, how are the CPU registers displayed?

answer

By calling the DumpRegs procedure.

question

In the AddSub program, which statement halts the program?

answer

The exit statement

question

Which directive begins a procedure?

answer

The PROC directive

question

Which directive ends a procedure?

answer

The ENDP directive

question

What is the purpose of the identifier in the END statement?

answer

It marks the last line of the program to be assembled, and the label next to END identifies the program's entry point (where execution begins).

question

What does the PROTO directive do?

answer

PROTO declares the name of a procedure that is called by the current program.

question

What types of files are produced by the assembler?

answer

Object .OBJ and listing .LST files.

question

The linker extracts assembled procedures from the link library and inserts them in the executable program.

answer

True

question

When a program's source code is modified, it must be assembled and linked again before it can be executed with the changes.

answer

True

question

Which operating system component reads and executes programs?

answer

Loader

question

What types of files is produced by the linker?

answer

Executable .EXE

question

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

answer

var1 SWORD ?

question

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

answer

var2 BYTE ?

question

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

answer

var3 SBYTE ?

question

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

answer

var4 QWORD ?

question

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

answer

SDWORD

question

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

answer

var5 SDWORD -2147483648

question

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

answer

wArray WORD 10, 20, 30

question

Declare a string variable containing the name of your favorite color. Initialize it as a nullterminated string.

answer

myColor BYTE "blue", 0

question

Declare an uninitialized array of 50 unsigned doublewords named dArray.

answer

dArray DWORD 50 DUP(?)

question

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

answer

myTestString BYTE 500 DUP("TEST")

question

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

answer

bArray BYTE 20 DUP(0)

question

Show the order of individual bytes in memory (lowest to highest) for the following doubleword variable: val1 DWORD 87654321h

answer

21h, 43h, 65h, 87h

question

Declare a symbolic constant using the equal-sign directive that contains the ASCII code (08h) for the Backspace key.

answer

BACKSPACE = 08h

question

Declare a symbolic constant named SecondsInDay using the equal-sign directive and assign it an arithmetic expression that calculates the number of seconds in a 24-hour period.

answer

SecondsInDay = 24 * 60 * 60

question

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(?)

answer

ArraySize = ($ - myArray)

question

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(?)

answer

ArraySize =($ - myArray) / TYPE DWORD

question

Use a TEXTEQU expression to redefine "PROC" as "PROCEDURE."

answer

PROCEDURE TEXTEQU

question

Use TEXTEQU to create a symbol named Sample for a string constant, and then use the symbol when defining a string variable named MyString.

answer

Code example: Sample TEXTEQU MyString BYTE Sample

question

Use TEXTEQU to assign the symbol SetupESI to the following line of code: mov esi,OFFSET myArray

answer

SetupESI TEXTEQU

Assembly Quiz 3 – Flashcards

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