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I'm glad you figured it out. We often learn more by finding and correcting our own "silly" mistakes than we do by being perfect every time.

Trace your code. Pick a small value of 'a', like 4 or 5, and construct a table that contains the value of each variable, i, j, and a after each for loop completes for both cases. You will see that...

Please post your code in code tags.

I don't understand why you're asking, "If I change my code, why does the output change?" Isn't that expected, even obvious? Can you state your question more...