Assembly Language Conditional Jumps Quiz
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Questions and Answers

What does the CMP instruction do in assembly language?

  • It divides the source operand by the destination operand, updating the flags.
  • It compares the source operand with the destination operand, updating the flags without changing either operand. (correct)
  • It multiplies the source operand with the destination operand, updating the flags.
  • It adds the source operand to the destination operand, updating the flags.

    • What is the purpose of the conditional jump instruction that follows the CMP instruction?

  • To execute a jump to a different part of the program based on the value of both the source and destination operands.
  • To execute a jump to a different part of the program based on the result of the comparison. (correct)
  • To execute a jump to a different part of the program based on the value of the destination operand.
  • To execute a jump to a different part of the program based on the value of the source operand.

    • How can the carry flag be used to check the result of a subtraction operation?

  • The carry flag is set if a borrow is needed during the subtraction, indicating that the destination operand is larger than the source operand.
  • The carry flag is set if a borrow is needed during the subtraction, indicating that the source operand is larger than the destination operand. (correct)
  • The carry flag is set if the result of the subtraction is negative, indicating that the destination operand is larger than the source operand.
  • The carry flag is set if the result of the subtraction is positive, indicating that the source operand is larger than the destination operand.

    • What does the zero flag indicate after a subtraction operation?

    <p>The zero flag is set if the result of the subtraction is zero, indicating that the source and destination operands are equal.</p> Signup and view all the answers

    What is the purpose of using comparisons and boolean expressions in higher-level programming languages?

    <p>To provide the ability to perform conditional jumps in the program.</p> Signup and view all the answers

    What is the role of the overflow flag in the result of a subtraction operation?

    <p>The overflow flag is set if the result of the subtraction is too large to fit in the destination operand.</p> Signup and view all the answers

    What is the key difference between signed and unsigned numbers?

    <p>Signed numbers consider both the magnitude and the sign, while unsigned numbers only consider the magnitude.</p> Signup and view all the answers

    How are the numbers $-2$ and $2$ compared differently for signed and unsigned numbers?

    <p>For signed numbers, $-2$ is less than $2$, but for unsigned numbers, $2$ is greater than $-2$.</p> Signup and view all the answers

    How are signed and unsigned numbers represented in two's complement notation?

    <p>Signed numbers are represented in two's complement notation, while unsigned numbers are not.</p> Signup and view all the answers

    What is the key idea regarding the representation of $-2$ and $65534$ in two's complement notation?

    <p>The representation of $-2$ and $65534$ would be the same, but the processor would treat them differently based on whether they are interpreted as signed or unsigned.</p> Signup and view all the answers

    How do the conditional jump operations JG and JL work differently for signed and unsigned numbers?

    <p>JG and JL work properly for signed numbers, but JA and JB work properly for unsigned numbers.</p> Signup and view all the answers

    What is the key idea regarding the comparison of $-2$ and $2$ using the CMP instruction?

    <p>The CMP instruction performs a normal subtraction, and the intent to treat the numbers as signed or unsigned is conveyed during the conditional jump operation.</p> Signup and view all the answers

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