28. Bit Field Operations-i

Question.2

A developer wants to update the MODE field (bits 12–15) in a 16-bit register from 0xA to 0x5. The register currently holds 0xA3F5. He writes:

reg |= (0x05 << 12);

What is wrong with this code?

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The shift amount should be 8, not 12
The old MODE bits are not cleared
To set the right value, developer need to use “&=” operator.
Nothing — OR correctly replaces the field