Question: Write a method called firstDigit that returns the first (most significant) digit of an integer. For example, firstDigit(3572) should return 3. It should work for

Write a method called firstDigit that returns the first (most significant) digit of an integer. For example, firstDigit(3572) should return 3. It should work for negative numbers as well;

firstDigit(-947) should return 9.

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