R4.14) How do you get the last digit of an integer? The first digit? That is, if

Question

R4.14) How do you get the last digit of an integer? The first digit? That is, if n is 23456, how do you find out that the first digit is 2 and the last digit is 6? Do not convert the number to a string. Hint: %, Math.log

Explanation / Answer

1) 2 is an int (integer), 2.0 is a float or double, '2' is a char (character), "2" and "2.0" are Strings. 2) y = x+x computes the sum of the integer x with itself. so y will have the value 4. t = s + s means that the String s is concatenated with itself, resulting in t being the String "22". 3) Yes, both are the same VALUE. Not the same objects though. 4) int lastDigit = n % 10; int firstDigit = n; while (firstDigit > 9) { firstDigit = firstDigit / 10; } 5) A variable can be declared final. A final variable may only be assigned to once. It is a compile time error if a final variable is assigned to unless it is definitely unassigned (§16) immediately prior to the assignment. A blank final is a final variable whose declaration lacks an initializer.

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