KwickClips Computer Systems · 40 sec · free
What does a left shift by 1 do?
Short answer. It doubles the number.
What happens to bits pushed off the end?
They are lost.
Logical shifts
| Shift | Bits | Value |
|---|---|---|
| Start | 0001 0110 | 22 |
| Left 1 | 0010 1100 | 44 |
| Right 1 | 0000 1011 | 11 |
Remember
| Left shift doubles |
| Right shift halves |
Can you double a number without adding? Shift the bits. Start with twenty two. Shifted left, it is forty four. Shifted right, it is eleven. Remember. Left doubles. Right halves, and lost bits are gone.
This clip is from the full lesson: Binary Arithmetic: Addition, Overflow, Two's Complement and Shifts — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ISC Class 11 Computer Science (868), Cambridge IGCSE Grade 9 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478), Edexcel GCSE GCSE Computer Science (1CP2)
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