how to use while loop

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Sharen H
Sharen H 2012-11-23
i have written a code to find the mod and dividend values of an image.if i
use while loop its getting executed continuously with out stop..can any one
help me where i am wrong...Thanks in advance
share = [250 250 ]
k=ceil(log(250)/log(5));
[r,c]=size(share)
for m= 1:r
for n = 1:c
while share(m,n)>=0
digits=mod(share(m,n),5)
share(m,n)=ceil(share(m,n)/5)
end
end
end

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回答（2 个）

Walter Roberson
Walter Roberson 2012-11-23
Suppose share(m,n) was 1. Then 1/5 is 0.2 and ceil(0.2) is 1. Opps, infinite loop!
Matt Fig
Matt Fig 2012-11-23
编辑：Matt Fig 2012-11-23
Think about this for a second: share(m,n) is initially positive. Then you repeatedly divide it by 5 in the inner while loop. How do you expect to ever get share(m,n) to be negative simply by dividing it by 5? But that is exactly what is needed to break that inner while loop....
For all x > 0: x/5 > 0, correct? So of course x/5 >= 0

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