Question

Question 4 (2 points)

Consider the C statements below. Assume x has been assigned a value.

int mask = 0xFF000000;

y = x ^ mask;

Which one of the following best describes the value computed for variable y?

Question 4 options:

	y contains the most significant byte of x complemented, with the rest of the bits unchanged
	y contains the most significant byte of x unchanged, with the rest of the bits 0
	y contains the most significant byte of x unchanged, with the rest of the bits 1
	y contains the most significant byte of x zeroed, with the rest of the bits unchanged
	none of these

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Question 5 (2 points)

Consider the C statements below. Assume x has been assigned a value.

int mask = 0x000000FF;

y = x & mask;

Which one of the following best describes the value computed for variable y?

Question 5 options:

	y contains the least significant byte of x, with all other bits set to 0
	y has all bits set to 1
	y contains the least significant byte of x, with all other bits set to 1
	y has all but the least significant byte zeroed, with the least significant byte complemented
	none of these

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Question 6 (2 points)

Determine x, as a logical value, after the statements below. See the hint for a note about 'logical'.

int a = 4, b = 3, x;

x = !a;

Question 6 options:

	True
	False

Hide hint for Question 6
logical means we could use x in an if statement: if ( x )    so would x be considered True or False?

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Question 7 (3 points)

Determine x, as a logical value, after the statements below. See the hint for a note about 'logical'.

int a = 0, b = 2, x;

x = !( !a  && !b)

Question 7 options:

	True
	False

Hide hint for Question 7
logical means we could use x in an if statement: if ( x )    so would x be considered True or False?

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Question 8 (2 points)

Suppose the variable x has the value shown. Determine the result of the indicated left shiftoperation(s) as a single byte in hexadecimal.

int  x = 0xC5;

     x << 2

Question 8 options:

	0x8A
	0xD6
	none of these
	0x62
	0x14

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suggestion: convert to binary, do the shift, convert back to hex

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Question 9 (2 points)

Suppose the variable x has the value shown. Determine the result of the indicated right logical shift operation(s) as a single byte in hexadecimal.

int  x = 0xF6;

     x >> 2

Question 9 options:

	none of these
	0xD6
	0xD4
	0xE5
	0x3D

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suggestion: convert to binary, do the shift, convert back to hex

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Question 10 (2 points)

Suppose the variable x has the value shown. Determine the result of the indicated right arithmetic shift operation(s) as a single byte in hexadecimal.

int  x = 0xCA;

     x >> 2;

Question 10 options:

	0xFE
	0x32
	0xA8
	0x65
	none of these

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suggestion: convert to binary, do the shift, convert back to hex

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Question 11 (2 points)

The largest unsigned value that may be represented using 6 bits is 63.

Question 11 options:

	True
	False

Answer 1

4)y contains the most significant byte of x complemented, with the rest of the bits unchanged

5) y contains the least significant byte of x, with all other bits set to 0

6) !a = 0
FALSE

7)

int a = 0, b = 2, x;

x = !( !a  && !b) => !(1 && 0) => !(0) = True

Answer: True

8) 0xC5 = 1100 0101 << 2 = 0001 0100 = 0x14
Answer: 0x14



9) 0xF6 = 1111 0110 >> 2 = 0011 1101 = 0x3D
Answer: 0x3D

10)  0xCA = 1100 1010 >> 2 = 0011 0010 = 0x32
Answer: 0x32

11) The largest unsigned value that may be represented using 6 bits is 63.

2⁶ - 1 = 63

TRUE



Thanks, PLEASE UPVOTE