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Welcome to the Understanding Compiled Arithmetic MCQs Page

Dive deep into the fascinating world of Understanding Compiled Arithmetic with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Understanding Compiled Arithmetic, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Understanding Compiled Arithmetic, 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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Check out the MCQs below to embark on an enriching journey through Understanding Compiled Arithmetic. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Understanding Compiled Arithmetic. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Understanding Compiled Arithmetic MCQs | Page 2 of 7

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Q11.
What is the Zero Flag used for in IA-32 code?

a.

Comparing two operands and testing whether they are equal.

b.

Setting the value of the most significant bit of the result.

c.

Reporting the binary parity of the lower 8 bits of certain arithmetic results.

d.

None of the above.

Discuss
Answer: (a).Comparing two operands and testing whether they are equal. Explanation:The Zero Flag is set when the result of an arithmetic operation is zero, and it is cleared if the result is nonzero. ZF is used in quite a few different situations in IA-32 code, but probably one of the most common uses it has is for comparing two operands and testing whether they are equal.
Q12.
What value does the Sign Flag denote in signed integers?

a.

The binary parity of the lower 8 bits of the result.

b.

Whether the result is zero or nonzero.

c.

The sign of the integer.

d.

None of the above.

Discuss
Answer: (c).The sign of the integer. Explanation:The Sign Flag receives the value of the most significant bit of the result (regardless of whether the result is signed or unsigned). In signed integers, this is equivalent to the integer’s sign. A value of 1 denotes a negative number in the result, while a value of 0 denotes a positive number (or zero) in the result.
Q13.
What is the Parity Flag?

a.

A flag used for comparing two operands and testing whether they are equal.

b.

A flag that reports the binary parity of the lower 8 bits of certain arithmetic results.

c.

A flag that denotes whether an overflow has occurred in signed operands.

d.

None of the above.

Discuss
Answer: (b).A flag that reports the binary parity of the lower 8 bits of certain arithmetic results. Explanation:The Parity Flag is a (rarely used) flag that reports the binary parity of the lower 8 bits of certain arithmetic results. Binary parity means that the flag reports the parity of the number of bits set, as opposed to the actual numeric parity of the result. A value of 1 denotes an even number of set bits in the lower 8 bits of the result, while a value of 0 denotes an odd number of set bits.
Q14.
Which instructions are used for adding and subtracting integers?

a.

ADD and SUB

b.

LEA

c.

MUL and DIV

d.

CMP

Discuss
Answer: (a).ADD and SUB Explanation:Integers are generally added and subtracted using the ADD and SUB instructions.
Q15.
Which operands can be used with the ADD and SUB instructions?

a.

Register names, immediate hard-coded operands, or memory addresses

b.

Immediate hard-coded operands only

c.

Register names only

d.

Memory addresses only

Discuss
Answer: (a).Register names, immediate hard-coded operands, or memory addresses Explanation:ADD and SUB instructions can take different types of operands, including register names, immediate hard-coded operands, or memory addresses.
Q16.
Which operand usually reflects a constant that was hard-coded into the source code?

a.

Immediate operand

b.

Memory operand

c.

Register operand

d.

None of the above

Discuss
Answer: (a).Immediate operand Explanation:Adding or subtracting an immediate operand usually reflects a constant that was hard-coded into the source code.
Q17.
Where is the result stored in addition and subtraction operations?

a.

Left-hand operand

b.

Right-hand operand

c.

Memory

d.

None of the above

Discuss
Answer: (a).Left-hand operand Explanation:Both the ADD and SUB instructions store the result in the left-hand operand.
Q18.
Does the LEA instruction perform any actual memory accesses?

a.

Yes

b.

No

c.

May be Yes or No

d.

Can't say

Discuss
Answer: (b).No Explanation:Even though most disassemblers add the words DWORD PTR before the operands, LEA really can't distinguish between a pointer and an integer and never performs any actual memory accesses.
Q19.
Which instructions are used to add and subtract integers on IA-32 processors?

a.

ADD and SUB

b.

LEA and ADD

c.

SHL and SHR

d.

DIV and MUL

Discuss
Answer: (a).ADD and SUB Explanation:Integers are generally added and subtracted using the ADD and SUB instructions on IA-32 processors.
Q20.
Why are LEA instructions used by compilers in some cases?

a.

They are faster than ADD and SUB instructions.

b.

They can distinguish between pointers and integers.

c.

They can perform memory accesses more efficiently.

d.

They are more compatible with Pentium 4 processors.

Discuss
Answer: (a).They are faster than ADD and SUB instructions. Explanation:On older implementations of IA-32, the LEA instruction was considered to be faster than ADD and SUB, which brought many compilers to use LEA for quick additions and shifts.
Page 2 of 7

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