The While Loop

Duration: 11 min

This video lesson is available to enrolled students.

Return to /learn/BIHAR-STET-COMPUTER-SCIENCE-COMPLETE-COURSE/unit-3-c-programming-data-structures/control-flow/loops-iteration/asset-the-while-loop after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the course: About the Course
  2. Mathematical Aptitude: Number System, HCF LCM, Divisibility Rules, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Time and Work, Mensuration and Geometry, Simple Interest and Compound Interest, Speed Time and Distance, Age Problems, Mixture and Alligation, Algebra, Powers and Exponents (Surds and Indices), Pipe and Cistern, Trigonometry, Statistics, Data Interpretation, Arithmetic
  3. Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Analogy, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Seating Arrangements, Syllogisms, Venn Diagram, Puzzle Solving (Puzzles), Logical Sequence Of Words, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Analytical Reasoning (Counting Figures Reasoning), Cubes & Dices, Calendar, Clock
  4. General Knowledge: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, GK- Current Affairs, Static General Knowledge
  5. Art of Teaching: Nature, Objectives & Characteristics of Teaching, Learners & Learning Process, Factors Affecting Teaching, Methods of Teaching, Classroom Management & Communication, Teaching-Learning Aids & ICT Integration, Evaluation, Assessment & Measurement, Professional Development & Ethics, Policies, Acts & Contemporary Issues, Curriculum & School Environment, Guidance, Counselling & Mental Health, Inclusive Education & Special Needs, Micro-Teaching & Teaching Skills, Lesson Planning
  6. Environmental Science: Environment
  7. Unit 1 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  8. Unit 2 | COA: 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
  9. Unit 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  10. Unit 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. Unit 4 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  12. Unit 5 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  13. Unit 6 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control
  14. Unit 7 | 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
  15. Unit 8 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  16. Unit 9 | Object Oriented Programming: OOPS with C++
  17. Unit 10 | Web Development: HTML Basics, CSS, JavaScript-Basics, XML
  18. Unit 11 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines
  19. Unit 12 | IoT: Emerging Tech Trends, Cloud Computing
  20. Unit 13 | Artificial Intelligence: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms
  21. Unit 14 | E-Commerce: Electronic Data Interchange and E-Commerce, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Physical Security and Cryptography Basics, Cyber Safety and Security
  22. Unit 15 | Multimedia: Multimedia
  23. Unit 16 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  24. Full Length Mock Tests — General Paper:
  25. Full Length Mock Tests — Computer Science (Paper II):
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces the concept of loops in programming, specifically focusing on the 'while' loop. The instructor begins by explaining the limitations of sequential and decision control structures, which execute actions only once. He introduces loops as a mechanism for repetition, essential for tasks like calculating salaries for multiple people. The video details the syntax, flowchart representation, and general form of the while loop. It includes a practical example of calculating simple interest for three sets of inputs. The lecture also warns against creating indefinite (infinite) loops and explains the behavior of increment and decrement operators, particularly post-increment within loop conditions.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor reviews previous programs that used sequential or decision control instructions, noting they were of 'limited nature' because they performed actions exactly once. He introduces the concept of repetition, stating 'Almost always, if something is worth doing, it's worth doing more than once.' He uses real-life examples like eating dinner or going to a movie to illustrate the need for loops. The section concludes by defining the 'loop' as the mechanism that meets the need to perform an action over and over with variations.

  2. 2:00 – 5:00 02:00-05:00

    The lecture formally introduces 'Loops', explaining that computer versatility lies in repeating instructions. Three methods are listed: for, while, and do-while statements. The instructor focuses on the 'while' loop, ideal for fixed repetitions like calculating gross salaries for ten persons. He presents a C program calculating simple interest for 3 sets of p, n, and r. The code shows initialization (`count = 1`), the condition (`while (count <= 3)`), and the increment (`count = count + 1`). A flowchart is displayed alongside the code to visualize the logic.

  3. 5:00 – 10:00 05:00-10:00

    The instructor illustrates the operation of the while loop with a flowchart showing Initialize, Test, Body of loop, and Increment steps. He presents the general form: `initialize loop counter; while (test loop counter using a condition) { ... increment loop counter; }`. He warns that the loop must test a condition that eventually becomes false, otherwise it is an indefinite loop. He shows an example where `i` remains 1 forever, causing an infinite loop. He then discusses increment (`++`) and decrement (`--`) operators, explaining that `while (i++ < 10)` performs comparison first, then increment (post-increment), requiring `i` to be initialized to 0.

  4. 10:00 – 11:12 10:00-11:12

    The video concludes this segment with a title slide displaying the word 'Break' in large text. Below it, the text '4 - for Loop' is visible, indicating the transition to the next topic in the series. The instructor briefly mentions the break statement before moving on to the for loop structure.

The lecture progresses from identifying the limitations of single-pass programs to introducing the necessity of loops for repetitive tasks. It provides a comprehensive overview of the 'while' loop, covering its theoretical basis, practical implementation in C code, and visual representation via flowcharts. Key technical details include the structure of initialization, condition testing, and incrementing, along with critical warnings about infinite loops and the specific behavior of post-increment operators within loop conditions.

Loading lesson…