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I guess it's a personal preference, but while(i == 1) seems fine to me. In fact I would say it's better than just while(i) because it makes it clear that 1 is the only value it should continue for.
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A boolean expression can be expressed like this:

i==0
i<76
i!=17
etc.

These evaluate to a boolean value (true or false). You can use boolean values in things like if statements and while...