Bit fiddling

[saurabhnsit2001]

I have got few questions on bit fiddling!!
1. Fast way of Multiplying a No by 7.
2. Counting no of set bits in a 32 bit no without looping.
3. finding id a no is divisible by 3 or not without using %, /, and -
operators,

 

[Tim Woodall]

I have got few questions on bit fiddling!!
1. Fast way of Multiplying a No by 7.
2. Counting no of set bits in a 32 bit no without looping.
3. finding id a no is divisible by 3 or not without using %, /, and -
operators,

Lookup table.

Tim.