Do not use any break statements to exit loops Do not use global variables There

Question

Do not use any break statements to exit loops Do not use global variables There should be no strings, reals, etc you cannot use codes like math.log()... class Utilities { // Reverses an integer. For example, 34 returns 43, 478 returns 874, 22 returns 22, and // -63 returns -36. static int reverse( int num ) { // Returns the sum of all of the divisors. For example, 7 returns 8 and 28 returns 56. static int divisorSum( int num ) { // Decide if the integer is some power of some other integer. For example, 8, 49, and 81 // return true while 10, 28, and 2 return false. (What should 0 and 1 return?) static isPower( int num ) { // Calculate the integer log base of. Do this by repeatedly dividing by 2 and counting. // For example, 2 and 3 return 1. 4, 5, 6, and 7 return 2. 80 and 100 return 6. static intLog( int num ) { }

Explanation / Answer

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public class Utilities {
    static int reverse(int num) {
        int newInt = 0;
        int remainder;
        int flag = 0;

        if (num < 0) {
            num = -num;
            flag = 1;
        }

        while (num > 0) {
            remainder = num % 10;
            newInt = (newInt * 10) + (remainder);
            num = num / 10;
        }
        if (flag == 1)
            newInt = -newInt;
        return newInt;
    }

    static int divisorSum(int num) {
        int divisor = 0;

        for (int i = 1; i <= num; i++) {
            if (num % i == 0)
                divisor = divisor + i;
        }
        return divisor;
    }

    static boolean isPower(int num) {
        boolean status = false;
        for (int i = 2; i < num; i++) {
            for (int j = 1; Math.pow(i, j) <= num; j++) {
                if (Math.pow(i, j) == num)
                    status = true;
            }

        }
        return status;
    }

    static int intLog(int num) {
        int count = 0;
        while (num > 1) {
            num = num / 2;
            count++;
        }
        return count;
    }

    public static void main(String[] args) {
        System.out.println(reverse(-123));
        System.out.println(divisorSum(28));
        System.out.println(isPower(49));
        System.out.println(intLog(100));
    }
}

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