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100+ Practice Questions ❍ C/C++ ❍ Python ❍ JavaScript ❍ Java ❍ C# ❍ Golang ➊ Simple Numbers ➀ Find a digit at a specific place in a number ➁ Find count of digits in a number ➂ Find the largest digit ➃ Find the 2nd largest digit ➄ Find the kth largest digit ➅ Find the smallest digit ➆ Find the 2nd smallest digit ➇ Find the kth smallest digit ➈ Find generic root (sum of all digits) of a number ➉ Reverse the digits in a number ➀➀ Rotate the digits in a number ➀➁ Is the number a palindrome? ➀➂ Find sum of 'n' numbers ➀➃ Check if a number is perfect square ➀➄ Find a number in an AP sequence ➀➅ Find a number in a GP sequence ➀➆ Find a number in fibonacci sequence ➀➇ Check number divisibility by 2, 3, 5, 9 ➀➈ Check if a number is primary or not 20. Given a number, print all primes smaller than it ➁➀ Check if a number is circular prime or not ➁➁ Find all prime factors of a number ➁➂ Find the GCD of 2 numbers ➁➃ Find the LCM of 2 numbers ➁➄ Find the factorial of a number ➁➅ Find the exponentiation of a number ➋ Unit Conversion ➀ Number Base (Binary, Octal, Hexadecimal, Decimal) ➁ Weight (gram, kg, pound) ➂ Height (cm, m, inch, feet) ➃ Temperature (centigrade, fahrenhite) ➄ Distance (km, mile) ➅ Area (m², km², acre) ➆ Volume (ltr, gallon) ➇ Time (sec, min, hour) ➈ Currency ➌ Calculator ➀ Loan EMI Calculator ➁ Fixed Deposit Returns Calculator ➂ Interest Calculator ➃ BMI Calculator ➄ Item Price (considering tax, discount, shipping) ➅ Tip Calculator ➍ Geometry ➀ Find distance between 2 points ➁ Given 2 sides of a right angle triangle, find the 3rd ➂ Find 3rd angle of a triangle when 2 are given ➃ Area of a triangle when 3 sides are given ➄ Area of a right angle triangle ➅ Perimeter of a Square ➆ Area of a Square ➇ Perimeter of a Rectangle ➈ Area of a Rectangle ➉ Circumference of a Circle ➀➀ Area of a Circle ➀➁ Circumference of a Semi-Circle ➀➂ Area of a Semi-Circle ➀➃ Area of a Ring ➀➄ Circumference of an Ellipse ➀➅ Area of an Ellipse ➀➆ Suface Area of a Sphere ➀➇ Volume of a Sphere ➀➈ Surface Area of a Hemisphere 20. Volume of a Hemisphere ➁➀ Surface area of a Cube ➁➁ Volume of a Cube ➁➂ Surface area of a Cylinder ➁➃ Volume of a Cylinder ➎ Vector ➀ Find Scalar Multiplication of a vector ➁ Find addition/subtraction of vectors ➂ Find magnitude of a vector ➃ Find an unit vector along a given vector ➄ Find dot product of 2 vectors ➅ Find cross product of 2 vectors ➆ Check if 2 vectors are orthogonal ➏ Matrix ➀ Find the determinant of a matrix ➁ Find Scalar Multiplication of a matrix ➂ Find addition/subtraction of matrices ➃ Find the transpose of a matrix ➄ Find if 2 matrices are orthogonal ➅ Find inverse of a 2x2 and 3x3 matrix ➐ Set ➀ Find Union of 2 sets ➁ Find Intersection of 2 sets ➂ Find the Difference of 2 sets ➃ Find the Symmetric Difference of 2 sets ➄ Find if a set is subset/superset of another set ➅ Find if 2 sets are disjoints ➑ Special Numbers ➀ Strong Number ➁ Perfect Number ➂ Armstrong Number ➃ Harshad Number ➄ Kaprekar Number ➅ Lychrel Number ➆ Narcissistic Decimal Number ➇ Lucus Number ➈ Catalan Number ➉ Duck Number ➀➀ Ugly Number ➀➁ Abundant Number ➀➂ Deficient Number ➀➃ Automorphic Number ➀➄ Magic Number ➀➅ Friendly Pair Numbers ➀➆ Neon Number ➀➇ Spy Number ➀➈ Happy Number 20. Sunny Number ➁➀ Disarium Number ➁➁ Pronic Number ➁➂ Trimorphic Number ➁➃ Evil Number ➁➄ Amicable Pairs ⬘ If you want to excel in programming, practice a lot. Join for more: https://t.me/programming_guide ⬙ Problems based on numbers are easy to start with and they help in improving your analytical skills.

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How to Learn Java in 2024 1. Set Clear Goals:    - Define your learning objectives. Do you want to build web applications, mobile apps, or work on enterprise-level software? 2. Choose a Structured Learning Path:    - Follow a structured learning path that covers the fundamentals of Java, object-oriented programming principles, and essential libraries. 3. Start with the Basics:    - Begin with the core concepts of Java, such as variables, data types, operators, and control flow statements. 4. Master Object-Oriented Programming:    - Learn about classes, objects, inheritance, polymorphism, and encapsulation. 5. Explore Java Libraries:    - Familiarize yourself with commonly used Java libraries, such as those for input/output, networking, and data structures. 6. Practice Regularly:    - Write code regularly to reinforce your understanding and identify areas where you need more practice. 7. Leverage Online Resources:    - Utilize online courses, tutorials, and documentation to supplement your learning. 8. Join a Coding Community:    - Engage with online coding communities and forums to ask questions, share knowledge, and collaborate on projects. 9. Build Projects:    - Create simple projects to apply your skills and gain practical experience. 10. Stay Updated with Java Releases:     - Keep up with the latest Java releases and updates to ensure your knowledge remains current. 11. Explore Frameworks and Tools:     - Learn about popular Java frameworks and tools, such as Spring Boot, Maven, and IntelliJ IDEA. 12. Contribute to Open Source Projects:     - Contribute to open source Java projects to gain real-world experience and showcase your skills. 13. Seek Feedback and Mentoring:     - Seek feedback from experienced Java developers and consider mentorship opportunities to accelerate your learning. 14. Prepare for Certifications:     - Consider pursuing Java certifications, such as the Oracle Certified Java Programmer (OCJP), to validate your skills. 15. Network with Java Developers:     - Attend Java meetups, conferences, and online events to connect with other Java developers and learn from their experiences.

System Design Cheat Sheet

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JavaScript, TypeScript, Python, Java, Go, Ruby, Rust, Ook!, PHP, or whatever else... A programming language doesn't matter as long as it gets the job done. Period.

Coding is 30% typing, 70% understanding why what you typed doesn't work.