Unary Operator
Duration: 4 min
This video lesson is available to enrolled students.
Inside: a video lesson and guided study material.
Module outline
- Reasoning Ability: Seating Arrangements, Syllogisms, Coding Decoding, Series (Number and Letter Series) (Numerical Relations and Reasoning), Crypt Arithmetic, Clock, Calendar, Data Sufficiency, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Blood Relations, Directions (Direction Test), Inequality
- Technical Ability (Aptitude): Percentage, Ratio and Proportion (Ratios), HCF LCM, Divisibility Rules, Average, Sequence and Series (Series), Number System, Permutation and Combination, Probability, Profit and Loss, Time and Work, Simple Interest and Compound Interest, Pipe and Cistern, Speed Time and Distance, Mixture and Alligation, Mensuration and Geometry, Age Problems, Partnership, Data Interpretation, Arithmetic, Powers and Exponents (Surds and Indices), Algebra, Statistics, Mental Ability
- Verbal Ability: Vocabulary, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Verbal Analogy (Word Based Analogy), Sentence Construction, Facts, Inference and Judgements
- Programming Fundamentals: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums
- Coding: Coding Questions by Yash Sir, C Programming by Yash Sir, Python for Placements by Yash Sir, DSA using Python, Object Oriented Programming (OOPS)
- Pseudo Code: Pseudo Codes
- Puzzle Solving: Puzzle Solving (Puzzles)
- English Grammar: Noun, Pronoun, Adjectives, Preposition, Articles, Direct and Indirect Speech, Tenses, Conjunction, Subject Verb Agreement (Verb Noun Agreement), Modals, Active Passive Voice (Voice), Determiner, Adverb, Verb
- Essay Writing: English Writing Ability
AI summary & chapters
AI Summary
An AI-generated summary of this video lecture.
This lecture introduces unary operators in C programming, defined as operations acting on a single operand. The instructor presents a comprehensive table listing operators including pre-increment (++x), post-increment (x++), pre-decrement (--x), and post-decrement (x--). Key distinctions are made between pre-operations, which modify the value before use, and post-operations, where the original value is used first. The lesson covers unary plus (+a) and minus (-a), logical NOT (!0 resulting in 1), and bitwise NOT (~n => -(n+1)). A specific example demonstrates that ~5 equals -6 through binary inversion and two's complement logic.
Chapters
0:00 – 2:00 00:00-02:00
The segment begins with a definition of unary operators as single-operand operations. A table is displayed listing C unary operators such as ++x, x++, --x, and x--. The instructor uses red checkmarks to highlight pre-increment and post-increment rows, emphasizing the difference in execution order. Handwritten annotations clarify that pre-operations modify immediately while post-operations use the value then increment, as seen in the text 'Use then a = a+1'. The table also lists unary plus (+a) and minus (-a), logical NOT (!01), establishing the foundational syntax for these operators.
2:00 – 3:38 02:00-03:38
The lecture progresses to bitwise NOT (~) and logical NOT operators. The instructor explains that!0 results in 1, demonstrating boolean logic inversion. A detailed derivation shows ~5 equals -6 using the formula ~n => -(n+1). Binary representation is used to visualize this: 5 is shown as 0101, which inverts to 1010. The instructor connects this binary result to the decimal value -6, illustrating two's complement logic. Handwritten notes reinforce the formula and binary conversion steps, ensuring students understand how bitwise negation produces negative results in signed integers.
The video systematically builds understanding of unary operators by first defining them and listing standard examples like increment/decrement. It then distinguishes between pre- and post-execution timing, a critical concept for C programming logic. The lesson culminates in bitwise operations, specifically showing how ~5 results in -6 via binary inversion and the formula -(n+1). This progression from simple arithmetic operators to bitwise logic ensures students grasp both syntax and underlying computational behavior.