Here are five programming interview questions related to loops:

Here are five programming interview questions related to loops:

1. **FizzBuzz with a Twist:**

   - Write a program that prints the numbers from 1 to N.

   - For multiples of 3, print "Fizz" instead of the number.

   - For multiples of 5, print "Buzz" instead of the number.

   - For numbers which are multiples of both 3 and 5, print "FizzBuzz".

   - Now, modify the program to replace any number containing the digit 3 with "Fizz" and any number containing the digit 5 with "Buzz".

2. **Reverse a String:**

   - Implement a function to reverse a given string without using any built-in reverse functions.

   - Optimize the solution to handle both iterative and recursive approaches.

3. **Sum of Digits:**

   - Write a program to find the sum of digits of a given positive integer.

   - Repeat the process until a single-digit result is obtained.

4. **Factorial Calculation:**

   - Implement a function to calculate the factorial of a non-negative integer using a loop.

   - Optimize the solution to handle both iterative and recursive approaches.

5. **Print a Pattern:**

   - Write a program to print the following pattern for a given integer N:

     ```

     1

     22

     333

     4444

     ...

     NNN...N

     ```

   - Implement the solution using nested loops.

These questions cover various aspects of loops, including basic control flow, string manipulation, digit manipulation, and pattern printing. They can help assess a candidate's understanding of loop constructs and problem-solving skills.

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