Treebeard's Stumper

Here's a fun number cruncher for vacation week. Use just the four digits 1, 9, 9, 7 in that order, with parentheses and any standard math operations, to make all the numbers 0, 1, 2, ... For starters,
0 = 1*(99)*7 1 = 1^(997) (to the power of) 2 = 1+sqrt(9)(97) (square root) 3 = 1997How far can you get? And what's the biggest number you can make?
Answer
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