Subroutine

Duration: 9 min

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Module outline

  1. About Course: About the Course
  2. Paper 2 | Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
  3. Paper 2 | Computer Organization And Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Control Unit Design, Instr Formats & Modes, Programming the Basic Computer
  4. Paper 2 | Analog And Digital Communication: Introduction to Communication Systems & Random Signals, Analog Communication Systems, Information Theory & Digital Communication Fundamentals, Digital Modulation & Detection Techniques, Error Control, Synchronization & Multiple Access Techniques
  5. Paper 2 | Programming in C: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  6. Paper 2 | Data Structures And Programming: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Java, OOPS with C++, Java Fundamentals, Array, String, IO & References
  7. Paper 2 | Algorithms: Algorithm Analysis, Sorting Algorithms, Time Complexity Analysis, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  8. Paper 2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  9. Paper 2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS
  10. Paper 2 | Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  11. Paper 2 | Information Systems and Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Paper 2 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics
  13. Paper 2 | Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, HTML Basics, JavaScript-Basics, CSS, XML, HTML5
  14. Paper 2 | Cyber Security And Emerging Technologies: Emerging Tech Trends
  15. Paper 2 | Cloud Technology: Cloud Computing
  16. Paper 2 | Probability and statistics: Probability, Statistics
  17. Paper-1 English: Vocabulary, Preposition, Articles, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Cloze Test (Cloze Passage), Sentence Construction
  18. Paper 1 General Mental Ability & Logical reasoning: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Percentage, Average, Powers and Exponents (Surds and Indices), Algebra, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Mensuration and Geometry, Mental Ability, Age Problems, Partnership, Arithmetic, Speed Mathematics and Basic Mathematics, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Selection Decision Table (Decision Making), Logical Sequence Of Words, Venn Diagram, Analogy
  19. Paper-1 General Knowledge & Current Affairs: State Wise GK, History, Geography, GK- Current Affairs, Static General Knowledge
  20. Full Length Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video is a lecture on subroutines in computer architecture, presented by an instructor. The lecture begins with a definition of a subroutine as a reusable set of instructions, highlighting its benefits of reusability and modularity. It explains that a branch can be made to a subroutine from any part of the main program and that the return address must be stored to enable a successful return. The instructor identifies the BSA (Branch and Save Address) instruction as the fundamental mechanism for linking the main program to a subroutine. The second part of the video transitions to a practical example, showing a program in assembly language that demonstrates the use of subroutines. The program's goal is to shift the content of the Accumulator (AC) four times. The instructor walks through the code, which includes a main program and a subroutine, and uses red annotations to illustrate the flow of control, showing how the BSA instruction branches to the subroutine and how the return address is managed. The final segment focuses on the subroutine itself, detailing the loop that performs the four left shifts and the return instruction (BUN SH4 I) that transfers control back to the main program, completing the subroutine call and return cycle.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video starts with a slide titled 'Subroutines'. The instructor defines a subroutine as 'A set of common instructions that can be used (called) in a program many times'. He emphasizes the benefits of reusability and modularity. The slide also states that a branch can be made to a subroutine from any part of the main program and that the return address must be stored to successfully return. The instructor explains that in a basic computer, the BSA (Branch and Save Address) instruction is the link between the main program and the subroutine. He begins to write 'functions' in red next to the title, and then adds 'reusability / modularity' to highlight the key advantages.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues to explain the concept of subroutines, emphasizing that they are a set of common instructions that can be called multiple times. He underlines the phrase 'A set of common instructions that can be used (called) in a program many times is called a subroutine' and adds 'reusability / modularity' in red. He then discusses the need to store the return address, writing 'stack' in red below the third bullet point, indicating that the return address is stored on the stack. He also underlines the word 'branch' in the second bullet point, reinforcing the idea of jumping to the subroutine.

  3. 5:00 – 9:14 05:00-09:14

    The video transitions to a new slide titled 'Program to demonstrate the use of subroutines: Shifting content of AC four times to the left'. The slide displays a table of assembly code. The instructor explains the main program, which loads a value into the accumulator (AC) and then branches to a subroutine using the BSA instruction. He points to the BSA SH4 instruction at location 102, explaining that it branches to the subroutine at location 109. He then explains the subroutine, which performs four left shifts (SH4) and then returns to the main program using the BUN SH4 I instruction. He uses red annotations to draw arrows showing the flow of control, labeling the main program and the subroutine, and highlighting the BSA and return instructions to illustrate the complete subroutine call and return process.

The lecture provides a comprehensive overview of subroutines, starting with a conceptual definition and its benefits, then moving to the technical implementation. It clearly explains the fundamental role of the BSA instruction in initiating a subroutine call and the necessity of storing the return address, which is managed by the stack. The practical example of shifting the accumulator content four times effectively demonstrates the entire process, from the main program's call to the subroutine's execution and its return, solidifying the understanding of how subroutines enable modular and efficient program design.

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