Codility:BinaryGap

binarygap.java

class BinaryGap {
    public int solution(int num) {
        boolean start = false;
        int maxZeroCount = 0;
        int zeroCount = 0;

        for (; num > 0 ; num = num / 2) {
            int b = num % 2;
            if (b == 1 && !start) {
                start = true;
            }
            if (start) {
                if (b == 0) {
                    zeroCount++;
                } else {
                    if (zeroCount > maxZeroCount) {
                        maxZeroCount = zeroCount;
                    }
                    zeroCount = 0;
                }
            }
        }

        return maxZeroCount;
    }

    public static void main(String[] args) {
        int res = new BinaryGap().solution(32);
        System.out.println(res);
    }
}

binarygap.js

function solution(num) {
        var start = false;
        var maxZeroCount = 0;
        var zeroCount = 0;

        for (; num > 0 ; num = Math.trunc(num / 2)) {
            var b = Math.trunc(num % 2);
            if (b == 1 && !start) {
                start = true;
            }
            if (start) {
                if (b == 0) {
                    zeroCount++;
                } else {
                    if (zeroCount > maxZeroCount) {
                        maxZeroCount = zeroCount;
                    }
                    zeroCount = 0;
                }
            }
        }

        return maxZeroCount;
}