Day 17 - HITech

public class Main {

    public static void main(String[] args) {

        String s = "abc";

        int sum = 0;

        for (char c : s.toCharArray()) {

            sum += c;

        }

        System.out.println(sum);

    }

}

• 294

• 297

• 300

• 303

public class Main {

    public static void main(String[] args) {

        String s = "a1b2c3";

        int sum = 0;

        for (int i = 1; i < s.length(); i += 2) {

            sum += s.charAt(i) - '0';

        }

        System.out.println(sum);

    }

}

• 6

• 3

• 5

• 4

public class Main {

    public static void main(String[] args) {

        int[] arr = {513, 46, 29};

        int max = 0;

        for (int num : arr) {

            while (num > 0) {

                max = Math.max(max, num % 10);

                num /= 10;

            }

        }

        System.out.println(max);

    }

}

• 6

• 5

• 9

• 3

public class Main {

    public static void main(String[] args) {

        String s = "6589";

        char[] arr = s.toCharArray();

        char temp = arr[0];

        arr[0] = arr[arr.length - 1];

        arr[arr.length - 1] = temp;

        System.out.println(new String(arr));

    }

}

• 6589

• 9586

• 9865

• 9568

public class Main {

    public static void main(String[] args) {

        int[] a = {10, 20, 30};

        int sum = 0;

        for (int i = 1; i < a.length; i++) {

            sum += a[i] - a[i - 1];

        }

        System.out.println(sum);

    }

}

• 20

• 10

• 30

• 40

public class Main {

    public static void main(String[] args) {

        String[] s = {"abc", "de", "fghi"};

        int count = 0;

        for (String str : s) {

            count += str.length();

        }

        System.out.println(count);

    }

}

• 4

• 8

• 5

• 9

public class Main {

    public static void main(String[] args) {

        int n = 237541;

        int count = 0;

        while (n > 0) {

            int d = n % 10;

            if (d == 2 || d == 3 || d == 5 || d == 7) count++;

            n /= 10;

        }

        System.out.println(count);

    }

}

• 6
• 5
• 4
• 3

public class Task {

    public static void main(String[] args) {

        String x = "983452";

        int a = -1, b = -1;

        for (char y : x.toCharArray()) {

            int z = y - '0';

            if (z > a) {

                b = a;

                a = z;

            } else if (z > b && z != a) {

                b = z;

            }

        }

        System.out.println(b);

    }

}

• 6
• 9
• 8
• 7

public class G {

    public static void main(String[] args) {

        int x = 17;

        boolean p = true;

        for (int i = 2; i * i <= x; i++) {

            if (x % i == 0) {

                p = false;

                break;

            }

        }

        System.out.println(p);

    }

}

• 17
• false
• true
• 1

public class H {

    public static void main(String[] args) {

        int n = 155, sum = 0, x = n;

        while (x > 0) {

            int d = x % 10;

            sum += d d d;

            x /= 10;

        }

        System.out.println(sum == n);

    }

}

• false
• 100
• null
• true