Functions

Duration: 5 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Analogy, Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement, Logical Sequence Of Words, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: Selection Decision Table (Decision Making)
  7. Paper-1 | General Science: Physics, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: State Wise GK, GK- Current Affairs
  9. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Combinational Circuit, Sequential Circuits
  10. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Calculus, Relational Algebra, SQL, NoSQL
  11. Paper-2 | Data Structures & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Algorithm Analysis, Sorting Algorithms, Intro to Compilers, Hashing
  12. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, Data Link Layer - Ethernet, DLL: Error Control, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Application Layer, Hardware basics, Network Security, Ethical Hacking
  13. Paper-2 | Operating Systems: Introduction to OS, Process Management, Memory Management, File Management, Deadlock
  14. Paper-2 | Computer Organization and Architecture: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer, Number System, Number Representation
  15. Paper 2 | System Analysis and Design: Fundamentals of Systems and Information Systems, Fundamentals of Software Engineering, SDLC and Development Approaches, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Security, Risk Management & Maintenance, Software Testing
  16. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Paper 2 | OOPS , C++ , JAVA: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  18. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  19. Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  20. Paper-2 | Data Processing (Ms-Office): MS Office Applications
  21. Paper-2 | Internet and Web Technologies: HTML Basics, CSS, XML, JavaScript-Basics, Internet Fundamentals, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, Terms & Abbreviations, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing
  22. Paper 2 | Pedagogy: Child Development, Theories, Concept of Pedagogy, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Psychology, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
  23. Live Classes: RSSB Live Sessions
  24. Paper 1 - Full Mock Tests:
  25. Paper 2 - Full Mock Tests:
  26. BCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture explains how to determine the output of a recursive function named `Print_array(a, i, j)`. The instructor sets up a specific example using an array `a` with values `{10, 30, 18, 7, 15, 22}` and initial parameters `i=1` and `j=4`. He traces the execution step-by-step, demonstrating how the function prints elements sequentially until the base case `i == j` is reached, resulting in the output sequence 30, 18, 7, 15.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with the instructor presenting a pseudo-code problem titled 'Find the output of the following pseudo code?'. The code defines a function `void Print_array(a, i, j)` with a base case `if (i == j)` that prints `a[i]` and returns. The else block prints `a[i]` and calls `print_array(a, i+1, j)`. To demonstrate, he draws an array `a` with indices 0 to 5 and fills it with values: 10, 30, 18, 7, 15, 22. He sets the initial call parameters as `i=1` and `j=4`, writing `print_array(a, 1, 4)` on the board to start the trace.

  2. 2:00 – 5:00 02:00-05:00

    The instructor performs a detailed trace of the recursion using a tree diagram. First, `print_array(a, 1, 4)` executes. Since `1 != 4`, it prints `a[1]` (value 30) and calls `print_array(a, 2, 4)`. Next, `print_array(a, 2, 4)` executes. Since `2 != 4`, it prints `a[2]` (value 18) and calls `print_array(a, 3, 4)`. Then, `print_array(a, 3, 4)` executes. Since `3 != 4`, it prints `a[3]` (value 7) and calls `print_array(a, 4, 4)`. Finally, `print_array(a, 4, 4)` executes. Here `4 == 4`, so it hits the base case, prints `a[4]` (value 15), and returns. He writes the sequence 30, 18, 7, 15 on the board.

  3. 5:00 – 5:08 05:00-05:08

    The instructor concludes the explanation by confirming the final output sequence. He writes the final answer '30 18 7 15' inside a box to signify the solution. He briefly reviews the trace to ensure the logic holds, emphasizing that the recursion stops exactly when the start index meets the end index, preventing infinite loops or out-of-bounds errors.

The lesson effectively demonstrates the mechanics of recursion by tracing a function that prints array elements within a specific range. By breaking down the base case and the recursive step, the instructor shows how the index `i` increments until it equals `j`, ensuring the correct subset of the array is printed. This method of drawing a recursion tree is a standard technique for visualizing and debugging recursive algorithms.

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