Stack Practice questions

Duration: 5 min

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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.

The video presents a C programming problem asking students to predict the output of a recursive function f(n) called with the argument 11. The instructor systematically traces the execution of the code, analyzing the base cases and recursive steps. He writes down the call tree on the whiteboard, breaking down f(11) into smaller sub-problems like f(5) and f(6). By evaluating each recursive call step-by-step, determining return values based on integer division and modulo operations, he calculates the final result. The process involves checking conditions like n <= 1 and n % 2 == 0 to decide the return path. The final output is determined to be 5, corresponding to option (D).

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the problem "Predict the output of following program" and displays the C code on screen. He starts tracing the function f(11) written on the board. He evaluates the first condition if(n <= 1) as false for 11. Then he checks if(n%2 == 0), noting that 11 is odd, so this is also false. Consequently, he moves to the final return statement return f(n/2) + f(n/2+1), substituting 11 to get return f(5) + f(6). He begins expanding f(5) by writing Ret f(2) + f(3) underneath it, indicating the next level of recursion. He then analyzes f(2), checking 2 <= 1 (false) and 2%2 == 0 (true), leading to return f(1). He establishes that f(1) returns 1 because 1 <= 1 is true, writing f(2) = 1 on the side.

  2. 2:00 – 5:00 02:00-05:00

    Continuing the trace, the instructor evaluates f(3). Since 3 is odd, it hits the final return statement: return f(1) + f(2). Using the previously calculated values where f(1) = 1 and f(2) = 1, he determines f(3) = 2. He writes f(3) = 2 on the board. Returning to f(5), he sums the results of its children: f(2) + f(3) becomes 1 + 2, so f(5) = 3. Next, he analyzes f(6). Since 6 is even, the condition n%2 == 0 is true, so it returns f(6/2) which is f(3). Since f(3) is already known to be 2, f(6) = 2. Finally, he combines the results for the initial call: f(11) = f(5) + f(6) becomes 3 + 2, resulting in 5. He writes f(11) = 5 clearly on the board.

  3. 5:00 – 5:08 05:00-05:08

    The instructor concludes the problem by confirming the calculated result is 5. He points to option (D) 5 and places a checkmark next to it, indicating it is the correct answer. He briefly dismisses the other options, crossing out (A) Stack Overflow, (B) 3, and (C) 4 to show they are incorrect. The video ends with the final answer selected.

The lecture demonstrates a methodical approach to solving recursive function problems by manually tracing the call stack. The instructor breaks down complex calls into simpler sub-problems, utilizing a top-down expansion strategy. By calculating base cases first and working backwards up the recursion tree, he avoids stack overflow errors and correctly computes the final integer value. This step-by-step evaluation highlights the importance of understanding integer division and modulo operators in C recursion.

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