So I have a for loop which goes like this:
for(span=N>>1;span;span>>=1)
I am assuming the start and end conditions are equivalent to as follows:
span = N>>1; //right shift N by 1 and initialize to span
while(span!=0)
{
span = span >> 1;
}
However it seems a little bizarre in the context of my code. Thanks in advance!
In every iteration you are dividing the variable span by 2 until it reaches 0.
so if initially N = 8, then values for span will be 4, 2, 1, 0 -> exit loop
That is correct.
span = N >> 1
, right-shifting N by 1. span
, which is equivalent to span != 0
. span
is right-shifted again by 1. In the context of positive integers, this is equivalent to for(span=N/2;span>0;span/=2)
. However, without knowing your particular context I cannot comment whether this is or is not bizarre.
简短而甜美...是的,只要您已经展示了代码,您的解释就坚定而良好。
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