Tech Jargon - Decoded

Reverse a Number

public class ReverseNumber {

    public static int reverse(int number) {
        int reversed = 0;
        while (number != 0) {
            int digit = number % 10;
            reversed = reversed * 10 + digit;
            number /= 10;
        }
        return reversed;
    }

    public static void main(String[] args) {
        int num = 12345;
        int reversedNum = reverse(num);
        System.out.println("Original Number: " + num);
        System.out.println("Reversed Number: " + reversedNum);
    }
}

#Java #Interview #Digits

Count Digits Without % or /

public class CountDigits {
  public static int countDigits(int number) {
    if (number == 0) {
      return 1;
    }
    int count = 0;
    int num = Math.abs(number);
    while (num > 0) {
      num = num - (int)Math.pow(10, (int)Math.log10(num));
      count++;
    }
    return count;
  }

  public static void main(String[] args) {
    System.out.println(countDigits(12345));
    System.out.println(countDigits(-123));
    System.out.println(countDigits(0));
  }
}

#Java #Swap #Interview

Swap Two Numbers Without Temp

public class SwapNumbers {
    public static void main(String[] args) {
        int a = 10;
        int b = 5;

        System.out.println("Before swap: a = " + a + ", b = " + b);

        a = a + b;
        b = a - b;
        a = a - b;

        System.out.println("After swap: a = " + a + ", b = " + b);
    }
}

Swap Two Numbers Without a Temporary Variable

public class SwapNumbers {
 public static void main(String[] args) {
 int a = 10;
 int b = 5;
 System.out.println("Before swap: a = " + a + ", b = " + b);
 a = a + b;
 b = a - b;
 a = a - b;
 System.out.println("After swap: a = " + a + ", b = " + b);
 }
}

#Java #Interview #Swap

Swap Two Numbers Without Temp

public class Swap {
 public static void main(String[] args) {
 int a = 5;
 int b = 10;
 
 a = a + b;
 b = a - b;
 a = a - b;
 
 System.out.println("a = " + a);
 System.out.println("b = " + b);
 }
}

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