Reverse Number in C++: Naive, Loop, and String Methods

Reverse Number is a staple interview problem: given a non-negative integer N, output the integer obtained by writing its digits in the opposite order. The task reinforces integer arithmetic, string handling, and edge-case thinking. 🔹 Problem Statement Input: A single non-negative integer N (0 ≤ N ≤ 1018). Output: The number obtained by reversing the … Read more

Count Digits in C++: Solutions with Code and Dry Run

Count Digits is a classic warm-up problem: given a non-negative integer N, determine how many digits it contains. Although trivial to humans, it teaches loop control, integer math, and logarithms—skills that resurface in harder interview questions. 🔹 Problem Statement Input: A single non-negative integer N (0 ≤ N ≤ 1018). Output: The count of decimal … Read more

Google DSA Sheet: Must-Solve Coding Interview Problems with Solutions

This single-file Google DSA sheet is beginner-friendly and structured to guide candidates from interview overview to hands-on practice, with high-impact coding questions organized by topic. Designed for clarity and SEO, this Google DSA sheet starts with a crisp overview of Google’s interview rounds, then for each topic gives a 1–2 line explanation followed by an … Read more

Inline in C++: Meaning, Syntax, Functions, Variables, and Best Practices

Inline in C++ is a keyword and linkage feature that lets you define small functions (and variables since C++17) in headers without violating the One Definition Rule, while giving the compiler freedom to inline calls for performance. It does not force inlining; the optimizer ultimately decides whether to inline a call. This beginner-friendly guide explains … Read more

Storage Class in C++: static, extern, thread_local and more

The phrase storage class in C++ refers to how and where an object is stored, its lifetime, and its visibility (linkage). In practice you control this with keywords like static, extern, and thread_local, plus your choice of scope and allocation style. This beginner-friendly guide breaks down every storage class in C++ you’ll actually use, with … Read more

Move in C++: std::move, Move Semantics, and Efficient Resource Transfers

move in C++ refers to move semantics and the std::move utility that let you transfer resources from one object to another instead of copying, enabling big performance wins for large or non-copyable objects. std::move doesn’t move by itself—it casts to an rvalue so a move constructor or move assignment can run. This beginner-friendly guide explains … Read more

What is Shallow Copy vs Deep Copy in C++?

Shallow Copy vs Deep Copy in C++ determines whether a copy duplicates just pointers (sharing the same underlying resource) or also duplicates the pointed-to data (owning a separate resource). Mastering this concept prevents bugs like double-free, memory leaks, and unexpected aliasing in your programs. This beginner-friendly guide explains Shallow Copy vs Deep Copy in C++ … Read more

Copy Constructor in C++: Default, User-Defined, Deep Copy & Best Practices

A Copy Constructor in C++ is a special constructor that creates a new object as a copy of an existing one, typically declared as ClassName(const ClassName& other). It is invoked on copy-initialization, when passing or returning objects by value, and in several other copying scenarios. This beginner-friendly guide explains the Copy Constructor in C++ with … Read more

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