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Double Pointers in C: Memory Model and Worked Examples
7+ hour, 51+ min ago (317+ words) Exam prep & CS education Here, value stores 24, p stores the address of value, and pp stores the address of p. Use the state before the assignment to 81 and track one pointer level at a time. Meaning or value before mutation This…...
Pointer Arithmetic in C: Rules and Worked Examples
3+ day, 10+ hour ago (634+ words) Understand how C pointers move across arrays, where arithmetic is valid, and why one-past pointers are useful but never readable. Includes code, traces, and common traps. Exam prep & CS education The useful operations are p + n, p - n, p++, p--, p…...
DFA Basics and Definitions
5+ day, 23+ hour ago (957+ words) Understand what makes a finite automaton deterministic and complete. Build one DFA for strings ending in 01, trace inputs, test acceptance, and repair a missing transition. Exam prep & CS education Use CS Fundamentals for Exams & Placements as the broader subject hub…...
C++ const vs constexpr vs consteval: One Worked Program
1+ week, 23+ hour ago (665+ words) See exactly what each C++ keyword guarantees. One C++20 program separates immutability, optional constant evaluation and mandatory constant evaluation. Exam prep & CS education Start with an ordinary function and a const object: Do not turn that into the rule "const…...
Python Big-O: list, dict and set operation costs
1+ week, 6+ day ago (1087+ words) A compact guide to the real cost of everyday Python container operations, with one duplicate-detection example that shows how a list can turn linear work into quadratic work. Exam prep & CS education A Python solution can be logically correct and…...
File Handling in C++: Read, Write, Append & Seek Examples
2+ week, 1+ day ago (542+ words) Learn how C++ file streams work through connected text and binary examples, from safe record parsing to appending data and updating a fixed record. Exam prep & CS education The header provides three stream classes. std::ifstream reads from a file,…...
Compiled vs Interpreted vs JIT: How Code Runs
2+ week, 4+ day ago (854+ words) Trace one program from source to CPU through ahead-of-time compilation, bytecode interpretation and JIT compilation. Then compare their costs without relying on labels. Exam prep & CS education What is the starting artifact: source, bytecode or a native executable? When does…...
Strings in C++: Beginner Tutorial with Runnable Examples
2+ week, 5+ day ago (734+ words) Learn how std::string behaves through exact outputs, safe input patterns, a worked index trace, common traps, and three short practice problems. Exam prep & CS education std::string is the standard-library type for a sequence of characters. The text "Gate…...
Recursion in C: Stack Frames and GATE Question Traps
2+ week, 6+ day ago (1017+ words) Trace recursive C programs without guessing. Follow factorial returns, prints on descent and unwind, Fibonacci call counts, and maximum stack depth. Exam prep & CS education Recursion questions become difficult when you try to hold the whole call tree in your…...
Virtual Machines in OS: Hypervisors and a Worked Plan
3+ week, 4+ day ago (1021+ words) Follow one three-VM host plan from the hypervisor layer to CPU scheduling, address translation, virtual I/O, isolation, snapshots and migration. Exam prep & CS education A system VM is a software-defined computer with virtual CPU, memory, storage, network and firmware....