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Welcome to the Deciphering Code Structures MCQs Page

Dive deep into the fascinating world of Deciphering Code Structures with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Deciphering Code Structures, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Deciphering Code Structures, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Reverse Engineering.

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Deciphering Code Structures MCQs | Page 1 of 11

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Q1.
What distinguishes a full-blown computer from an average pocket calculator?

a.

The ability to perform complex mathematical operations

b.

The ability to execute a sequence of logical and conditional instructions

c.

The presence of a graphical user interface

d.

The ability to connect to the internet

Discuss
Answer: (b).The ability to execute a sequence of logical and conditional instructions Explanation:The ability to execute a sequence of logical and conditional instructions distinguishes a full-blown computer from an average pocket calculator.
Q2.
What is the purpose of operand comparison in logical statements?

a.

To perform mathematical calculations

b.

To determine the result of a logical statement

c.

To compare two or more values and act based on the comparison result

d.

To convert binary code to assembly language

Discuss
Answer: (c).To compare two or more values and act based on the comparison result Explanation:The purpose of operand comparison in logical statements is to compare two or more values and act based on the comparison result.
Q3.
What is the fundamental instruction for comparing operands in IA-32 assembly language?

a.

ADD

b.

SUB

c.

CMP

d.

MOV

Discuss
Answer: (c).CMP Explanation:The fundamental instruction for comparing operands in IA-32 assembly language is CMP.
Q4.
What are the conditional codes in IA-32 assembly language used for?

a.

Comparing operands

b.

Performing mathematical calculations

c.

Executing conditional instructions

d.

None of the above

Discuss
Answer: (c).Executing conditional instructions Explanation:The conditional codes in IA-32 assembly language are used for executing conditional instructions.
Q5.
Are the flags read differently depending on whether the operands are signed or unsigned in IA-32 assembly language?

a.

Yes

b.

No

c.

May be Yes or No

d.

Can't say

Discuss
Answer: (a).Yes Explanation:The flags are read differently depending on whether the operands are signed or unsigned in IA-32 assembly language.
Q6.
When all three flags are zero after a signed integer comparison, what does it indicate?

a.

The operands are equal

b.

The first operand is greater than the second

c.

The second operand is larger than the first

d.

None of the above

Discuss
Answer: (b).The first operand is greater than the second Explanation:When all three flags are zero after a signed integer comparison, it indicates that the first operand is greater than the second because there is a positive result and no overflow.
Q7.
When is the second operand larger than the first in a signed integer comparison?

a.

When ZF is set

b.

When SF=1 and OF=0

c.

When there is an overflow and a positive result

d.

None of the above

Discuss
Answer: (b).When SF=1 and OF=0 Explanation:The second operand is larger than the first in a signed integer comparison when there is a negative result and no overflow (SF=1 and OF=0).
Q8.
Why is it helpful to understand how flags are set during comparison and subtraction?

a.

It helps in memorizing comparison outcome tables

b.

It helps in properly understanding logical sequences

c.

It helps in avoiding the use of flags in unconventional ways

d.

None of the above

Discuss
Answer: (b).It helps in properly understanding logical sequences Explanation:Understanding how flags are set during comparison and subtraction is helpful in properly understanding logical sequences and quickly deciphering their meaning.
Q9.
Why are unsigned operands easier to deal with in operand comparison?

a.

Because they don't require the use of conditional codes

b.

Because their behavior is easier to predict

c.

Because they have a larger range of values

d.

Because they require fewer instructions to compare

Discuss
Answer: (b).Because their behavior is easier to predict Explanation:The ground rules for identifying the results of unsigned integer comparisons are easier to deal with and that it's obvious that unsigned operands are easier to deal with.
Q10.
What are conditional codes?

a.

Suffixes added to certain instructions to define conditions governing their execution

b.

Instructions used for operand comparison

c.

Instructions used for unconditional jumps

d.

None of the above

Discuss
Answer: (a).Suffixes added to certain instructions to define conditions governing their execution Explanation:Conditional codes are suffixes added to certain conditional instructions in order to define the conditions governing their execution.
Page 1 of 11

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