Which of the following best describes what happens to the stored result in an 8-bit register when overflow occurs during addition?

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Question

Which of the following best describes what happens to the stored result in an 8-bit register when overflow occurs during addition?

Accepted Answer

The register stores an incorrect, truncated value as the carry is lost — When overflow occurs, the 9th (carry-out) bit cannot be stored in the 8-bit register and is lost, so the stored value is the lower 8 bits of the true result — an incorrect, truncated value. Option A is incorrect because registers have a fixed width and cannot expand. Option C is incorrect; the register does not default to zero. Option D is incorrect; the register stores the truncated sum, not one of the original operands.

Answer

The register stores the larger of the two original values

Answer

The register stores the correct sum with an extra bit appended

Answer

The register stores an incorrect, truncated value as the carry is lost

Answer

The register stores the value zero as a default error state

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