Set Bit
OR with a mask that has a single 1 at bit i.
Decision · step 2 of 3Bit Manipulation: Set a bit that was 0
The mask 1 shl 2 is 4, a single 1 at bit 2. Bit 2 of 178 is currently 0. OR with the mask forces that one bit to 1 and leaves the rest alone.
What you will see
A one-hot mask lines up under n; OR turns the bit on.
Cost
| Best | O(1) |
|---|---|
| Average | O(1) |
| Worst | O(1) |
| Space | O(1) |
How you work with it here
play it through, step one change at a time, run it on your own input, try operations in any order.
Screen readers: Each bit announces its position and value; each step announces the operation and the resulting number in binary and decimal.
Reduced motion: Bits flip with a crossfade; masks appear in place.
Before this
Taught by the same lesson
Bit Manipulation covers these too, in the same run.