Question 1

With signed operands,the CMP instruction makes the Sign flag equal to the Overflow flag when the destination operand is less than the source operand.

Accepted Answer

The CMP instruction sets the Sign flag and Overflow flag independently based on the result of the subtraction it performs (destination operand - source operand). The Sign flag indicates the sign of the result, and the Overflow flag indicates whether there was arithmetic overflow. Whether the destination operand is less than the source operand does not directly make the Sign flag equal to the Overflow flag.

Question 2

For any two integers n and m,((n XOR m)XOR m)produces n.

Accepted Answer

This is true.

When we XOR a number with another number and then XOR the result with the same number again, we are essentially reversing the effect of the first XOR operation.

In other words:

(n XOR m) XOR m = ((n XOR m) XOR m XOR m) = (n XOR (m XOR m)) = (n XOR 0) = n

Since XORing any number with 0 gives us the same number, the final result is n. Therefore, for any two integers n and m, ((n XOR m) XOR m) produces n.

Question 3

The JAE instruction jumps if the (unsigned)first operand is greater than or equal to the (unsigned)second operand.

Accepted Answer

The JAE (Jump if Above or Equal) instruction jumps if the first operand is greater than or equal to the second operand in unsigned comparison, but it does not compare operands directly; it checks the status of the Carry Flag (CF) being clear (CF=0) after a previous comparison or arithmetic operation.

Question 4

The XOR instruction inverts each bit in a destination operand.

Accepted Answer

The XOR instruction performs a bitwise XOR operation, which results in a 1 bit if the corresponding bits in the operands are different, and a 0 bit if they are the same. It does not invert each bit in a destination operand.

Question 5

The JO instruction is used after an operation involving signed integers.

Accepted Answer

The JO (Jump if Overflow) instruction is used after an operation involving signed integers to jump to a specific address if the signed result of the operation overflows.

Question 6

ANDing an operand with 1 sets the zero flag if the operand was originally an even number.

Accepted Answer

When an even number is ANDed with 1, the result is 0, setting the zero flag.

Question 7

The OR instruction can be used to find the intersection of two bit-mapped sets.

Accepted Answer

The OR instruction is used to find the union of two bit-mapped sets, not the intersection. The AND instruction is used for finding the intersection.

Question 8

The Parity flag indicates whether the lowest byte of a destination operand has an even number of 1 bits.

Accepted Answer

The parity flag (PF) is set when the least significant byte of a result contains an even number of 1 bits. It is cleared when the least significant byte has an odd number of 1 bits.

Question 9

XORing an operand with 1 always causes the Zero flag to be set.

Accepted Answer

XORing an operand with 1 only causes the Zero flag to be set if the operand is already 1. If the operand is 0, then XORing it with 1 will result in a 1, and the Zero flag will not be set.

Question 10

The JECXZ instruction jumps to a target label when the CX register is equal to zero.

Accepted Answer

The JECXZ instruction jumps to a target label when the CX register is equal to zero.

Question 11

The TEST instruction always alters the destination operand.

Accepted Answer

The TEST instruction does not alter the destination operand. Instead, it performs a logical AND operation between the source operand and the destination operand, and updates the flags register based on the result.

Question 12

The destination operand of the OR instruction cannot be a memory operand.

Accepted Answer

The destination operand of the OR instruction can be a register or a memory operand, but not an immediate value. The syntax for the OR instruction is: OR destination, source. Both the destination and source operands can be registers or memory operands.

Question 13

With unsigned operands,the CMP instruction sets the Carry flag when the destination operand is less than the source operand.

Accepted Answer

When comparing unsigned operands with the CMP instruction, the Carry flag is set when the destination operand is less than the source operand.

Question 14

The XOR instruction can be used to generate the two's complement of an integer.

Accepted Answer

The XOR instruction alone cannot generate the two's complement of an integer; generating the two's complement requires inverting all bits (which can be done with the NOT instruction) and then adding 1, which XOR alone cannot accomplish.

Question 15

The JBE instruction is used when comparing unsigned integers.

Accepted Answer

The JBE (Jump if Below or Equal) instruction is used to jump to a certain address if the result of an unsigned integer comparison is either below or equal to a certain value. Therefore, the statement "The JBE instruction is used when comparing unsigned integers" is true.

Quiz 6: Conditional Processing Assessment

With signed operands,the CMP instruction makes the Sign flag equal to the Overflow flag when the destination operand is less than the source operand.

For any two integers n and m,((n XOR m)XOR m)produces n.

The JAE instruction jumps if the (unsigned)first operand is greater than or equal to the (unsigned)second operand.

The XOR instruction inverts each bit in a destination operand.

The JO instruction is used after an operation involving signed integers.

ANDing an operand with 1 sets the zero flag if the operand was originally an even number.

The OR instruction can be used to find the intersection of two bit-mapped sets.

The Parity flag indicates whether the lowest byte of a destination operand has an even number of 1 bits.

XORing an operand with 1 always causes the Zero flag to be set.

The JECXZ instruction jumps to a target label when the CX register is equal to zero.

The TEST instruction always alters the destination operand.

The destination operand of the OR instruction cannot be a memory operand.

With unsigned operands,the CMP instruction sets the Carry flag when the destination operand is less than the source operand.

The XOR instruction can be used to generate the two's complement of an integer.

The JBE instruction is used when comparing unsigned integers.