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Its the termination condition for the whilr loop. For every number greater than or equal to 1 "and" treats its as 1, so when it reaches 0 the "and" will give the output 0 which will terminate the while loop.
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Arrays Introduction
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Its the termination condition for the whilr loop. For every number greater than or equal to 1 "and" treats its as 1, so when it reaches 0 the "and" will give the output 0 which will terminate the while loop.