Q10 - Precedence and Associativity
Duration: 3 min
This video lesson is available to enrolled students.
Inside: a video lesson and guided study material.
Module outline
- Quantitative Ability: Speed Mathematics and Basic Mathematics, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Speed Time and Distance, Number System, HCF LCM, Data Interpretation, Age Problems, Mixture and Alligation, Partnership, Algebra, Sequence and Series (Series), Mensuration and Geometry, Arithmetic
- Reasoning Ability: Puzzle Solving (Puzzles), Seating Arrangements, Coding Decoding, Blood Relations, Directions (Direction Test), Syllogisms, Data Sufficiency, Ranking, Order and Sequence, Series (Number and Letter Series) (Numerical Relations and Reasoning), Logical Sequence Of Words, Calendar, Clock, Cubes & Dices, Analytical Reasoning (Counting Figures Reasoning), Data Arrangement, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning)
- Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Vocabulary, Sentence Completion (Fill in the blanks), Active Passive Voice (Voice), Direct and Indirect Speech, Subject Verb Agreement (Verb Noun Agreement), Tenses, Preposition, Articles, Sentence Correction (Error Correction)
- Programming Basics (MCQs + Interview): C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
- OOPs (MCQs + Interview): Object Oriented Programming (OOPS)
- DBMS (MCQs + Interview): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Decomposition Properties & 4NF, Concurrency Control, Database Recovery, File Organization & Indexing, Relational Algebra, Database Security & Authorization
- SQL (MCQs + Interview): SQL
- Operating Systems (MCQs + Interview): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Process Synchronization, Disc Scheduling, File Management, Security
- Computer Networks (MCQs + Interview): 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, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
- Coding: Coding Questions by Yash Sir
- HR Interview: MR & HR Interview Preparation
AI summary & chapters
AI Summary
An AI-generated summary of this video lecture.
The video presents a coding problem involving the C++ modulus operator with a negative divisor. The question asks for the value of the expression `int x = 4 + 2 % (-8);`. The instructor first analyzes the expression by applying the order of operations, noting that the modulus operation `%` has higher precedence than addition. He then explains the mathematical rule for the sign of the modulus result, which is the same as the sign of the dividend (the number being divided). In this case, 2 is the dividend, so `2 % (-8)` evaluates to 2. The final result is `4 + 2`, which is 6. To confirm this, the instructor switches to a C++ online compiler, types the code, and runs it, showing the output as 6, thereby validating the theoretical calculation.
Chapters
0:00 – 2:00 00:00-02:00
The video begins with a question displayed on a whiteboard: `Q. The expression, int x = 4 + 2 % (-8); evaluates to:` with four options: (1) -6, (2) 6, (3) 4, (4) None of these. The instructor, Yash Jain, starts to solve the problem by writing the expression `4 + 2 % (-8)` on the board. He then performs a long division of 2 by -8, writing `8)2` and showing that 8 goes into 2 zero times with a remainder of 2. He concludes that `2 % (-8)` is 2. He then adds this to 4, writing `4 + 2` and getting the result 6. He circles the number 6 on the board, indicating it as the answer. He also writes a general rule: `a % (-b) = a % b` and `a % b` where `a < b`. He then writes `PUMA's REBL TAC` and `1234` with a circle around the number 3, possibly as a mnemonic or a joke.
2:00 – 2:48 02:00-02:48
The instructor transitions from the whiteboard to a live coding environment, an online C++ compiler. He types the code `#include <iostream> using namespace std; int main() { int x = 4 + 2 % (-8); cout << x; }`. He then clicks the 'Run' button. The output console displays the result as `6`. This practical demonstration confirms the theoretical calculation from the whiteboard, showing that the expression evaluates to 6. The instructor's final answer is 6, which corresponds to option (2).
The video effectively combines theoretical explanation with practical verification. It first presents a common point of confusion in programming: the behavior of the modulus operator with negative numbers. The instructor uses a step-by-step mathematical approach to demonstrate that the sign of the result is determined by the dividend, not the divisor. This is a crucial concept for understanding the C++ modulus operator. The lesson is then solidified by a live coding demonstration, which provides empirical evidence for the theoretical result, reinforcing the learning objective and ensuring the student understands both the 'why' and the 'how' of the operation.