Question:
The Carry Flag (CF) is set when
The Carry Flag (CF) is set when
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Remember the main status flags and their purposes: ZF (Zero Flag for zero result), SF (Sign Flag for negative result), CF (Carry Flag for unsigned overflow), and OF (Overflow Flag for signed overflow).
Updated On: Jul 2, 2026
- The result is negative
- An arithmetic operation results in a zero value
- A division operation produces a remainder
- An arithmetic operation results in a carry out of the most significant bit
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The Correct Option is D
Solution and Explanation
The Carry Flag (CF) is a single-bit flag in the processor's status register. Its primary purpose is to indicate overflow or underflow conditions for unsigned arithmetic.
Let's analyze the options:
(A) The Sign Flag (SF) is set when the result is negative.
(B) The Zero Flag (ZF) is set when an arithmetic operation results in a zero value.
(C) A division operation producing a remainder does not set the carry flag in this way. Flags are affected differently by division.
(D) During an addition operation, the Carry Flag is set to 1 if the addition of the Most Significant Bits (MSBs) produces a carry-out. For example, adding two 8-bit numbers that result in a 9-bit number. During a subtraction, it is set if a borrow is required from the MSB. This statement accurately describes the main function of the Carry Flag.
Let's analyze the options:
(A) The Sign Flag (SF) is set when the result is negative.
(B) The Zero Flag (ZF) is set when an arithmetic operation results in a zero value.
(C) A division operation producing a remainder does not set the carry flag in this way. Flags are affected differently by division.
(D) During an addition operation, the Carry Flag is set to 1 if the addition of the Most Significant Bits (MSBs) produces a carry-out. For example, adding two 8-bit numbers that result in a 9-bit number. During a subtraction, it is set if a borrow is required from the MSB. This statement accurately describes the main function of the Carry Flag.
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