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Message: [QUOTE="Skarmander, post: 2459853"] The "first 4 bits" is an ambiguous phrase, as is "bit 0, 1, 2 and 3". From which end do you wish to number them? Your first statement, variable name and comment all disagree on what you're trying to do. As far as the statement goes you apparently want bits 1, 2, 3 and 4 (numbering the least significant bit 0) in positions 0, 1, 2 and 3. If you instead want the four least significant bits, you can simply do x & 0x0f. Similarly, you are extracting bits 12-15 here. If 'x' is a 16-bit unsigned integer, those are the four most significant bits. Not quite. You may be off by one. The four least significant bits are 0-3, not 1-4, and they do not need to be shifted. S. [/QUOTE]