## how to use while loop

### Sharen H (view profile)

on 23 Nov 2012

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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### Walter Roberson (view profile)

on 23 Nov 2012

Suppose share(m,n) was 1. Then 1/5 is 0.2 and ceil(0.2) is 1. Opps, infinite loop!

### Matt Fig (view profile)

on 23 Nov 2012
Edited by Matt Fig

### Matt Fig (view profile)

on 23 Nov 2012

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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