Stack Practice questions

Duration: 5 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Aptitude: Ratio and Proportion (Ratios), Data Interpretation, Mixture and Alligation, Permutation and Combination, Number System, Sequence and Series (Series), Speed Time and Distance, Speed Mathematics and Basic Mathematics, Algebra, Percentage, Profit and Loss, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Partnership
  2. Reasoning Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Seating Arrangements, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Syllogisms, Blood Relations, Puzzle Solving (Puzzles), Inequality, Machine Input-Output
  3. English Language: Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Construction, Pronoun, Preposition, Conjunction, Adverb, Verb, Modals, Articles, Determiner, Interjection
  4. General Awareness: Evolution of Indian Banking (Banking & Financial Awareness), GK- Current Affairs, Static General Knowledge, Indian Economy
  5. C Concepts + MCQs (IT Specialist): C Programming by Yash Sir, C Language Core
  6. Java (IT Specialist): Java
  7. Python (IT Specialist): Python for Placements by Yash Sir, Python Basics
  8. OOPs (IT Specialist): Object Oriented Programming (OOPS)
  9. DBMS (IT Specialist): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  10. SQL (IT Specialist): SQL
  11. Software Engineering (IT Specialist): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Data Structure (IT Specialist): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  13. Operating System (IT Specialist): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  14. Compiler Design (IT Specialist): 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
  15. Computer Architecture (IT Specialist): Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Multiprocessors, Programming the Basic Computer
  16. Data Communication & Networking (IT Specialist): 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, Network Security
  17. Descriptive Test (Main Exam): English Writing Ability
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video demonstrates how to trace the execution of a recursive C function to determine its output. The instructor presents a code snippet containing a function named `print(int n)` which includes a base case check `if (n > 4000)`. The function prints the current value of `n`, calls itself recursively with `2*n`, and then prints `n` again. The `main` function initiates this process by calling `print(1000)`. The lecture focuses on manually stepping through the recursion stack to predict the sequence of numbers printed to the console.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by analyzing the provided C code, specifically the `print` function. He writes `print(1000)` on the whiteboard to represent the initial call from `main`. He evaluates the condition `if (n > 4000)` for `n=1000`, marking it as false. Consequently, the code proceeds to the first `printf("%d ", n)`, which outputs `1000`. He then identifies the next step as a recursive call `print(2*n)`, which becomes `print(2000)`. He starts drawing a tree diagram to visualize the call stack, placing `1000` as the root and `print(2000)` as the child node.

  2. 2:00 – 4:37 02:00-04:37

    Continuing the trace, the instructor evaluates `print(2000)`. The condition `2000 > 4000` is false, so it prints `2000` and calls `print(4000)`. Next, `print(4000)` is evaluated; `4000 > 4000` is false, so it prints `4000` and calls `print(8000)`. The instructor notes that `print(8000)` satisfies the base case `8000 > 4000`, causing the function to return immediately without printing. The execution then unwinds. The second `printf` in `print(4000)` executes, printing `4000`. Then the second `printf` in `print(2000)` executes, printing `2000`. Finally, the second `printf` in `print(1000)` executes, printing `1000`. The final sequence is `1000 2000 4000 4000 2000 1000`, corresponding to option (B).

The lesson effectively illustrates the two-phase nature of recursion: the forward pass where code executes before the recursive call, and the backward pass where code executes after the call returns. By tracing the specific values `1000`, `2000`, `4000`, and the base case `8000`, the instructor demonstrates how the first set of prints creates an ascending sequence while the return phase creates a descending sequence, resulting in a symmetric output pattern.

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