About the safe position

#1

at 27:40 what is happening in

p=safe & (-safe);

safe=safe-p;

and can you please explain about the 1’s(-) and 2’s(~) complement and their relation

#2

@SATVIK
In statement
p=safe & (-safe);
P gives 2^(last set bit in safe) as value

safe = safe - p subtracts last set bit from number

For detailed explanation please see https://www.geeksforgeeks.org/count-set-bits-in-an-integer/
Method 2

If your doubt is resolved please mark it as closed.

1 Like
#3

sorry, couldn’t get it

#4

@SATVIK
See this once https://www.youtube.com/watch?v=KJnhAUkxAho&feature=youtu.be

#5

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