Find Factorial of a number using iteration

Duration: 3 min

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Module outline

  1. TCS One Shot Free Videos & Notes: TCS Preparation
  2. Numerical Ability (Foundation Section): Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Powers and Exponents (Surds and Indices), Algebra, Probability, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Mensuration and Geometry, Mental Ability, Age Problems, Statistics, Arithmetic, Partnership, Speed Mathematics and Basic Mathematics
  3. Reasoning Ability (Foundation Section): Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Selection Decision Table (Decision Making), Crypt Arithmetic, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence, Logical Sequence Of Words
  4. New Pattern-Verbal Ability (Foundation Section): Sentence Completion (Fill in the blanks), English Writing Ability
  5. Old Pattern-Verbal Ability (Foundation Section): Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Pronoun, Preposition, Articles, Direct and Indirect Speech, Conjunction, Modals, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Verbal Analogy (Word Based Analogy), Active Passive Voice (Voice), Determiner, Facts, Inference and Judgements, Adverb, Cloze Test (Cloze Passage), Sentence Construction, Verb
  6. Advanced Quantitative Ability: TCS NQT Advanced Quantitative Ability
  7. Advanced Reasoning Ability: TCS NQT Advanced Reasoning Ability
  8. Advanced Coding: Coding Questions by Yash Sir, C Programming by Yash Sir, Python for Placements by Yash Sir, DSA using Python, Object Oriented Programming (OOPS), Programming in C++, Java
  9. TCS Full Length Mock Test:
  10. TCS Interview & Resume Prep: MR & HR Interview Preparation, TCS Interview Preparation, Mock Interview, Interview Recordings, Resume Preparation, Resume Review
  11. Mega Test:
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AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a comprehensive tutorial on calculating the factorial of a number using the C programming language. The lesson begins with an introduction to the concept of factorial, explaining it as the product of all positive integers from 1 to n, with a special case of 0! = 1. The instructor then presents a C code snippet that uses a for loop to iteratively calculate the factorial. The code is analyzed line by line, with the instructor using a whiteboard to illustrate the logic, including the initialization of the factorial variable to 1 and the loop's execution for a sample input of 5. The video concludes with a live demonstration in an online C compiler, where the code is executed with the input 5, confirming the output is 120, which is 5!.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video starts with the Knowledge Gate logo, followed by a slide detailing the organization's various educational offerings. The main content begins with a C code snippet for calculating a factorial. The instructor, visible in a small window, explains the code, which includes the standard library inclusion, main function, and variable declarations. He highlights the use of an unsigned long long data type for the factorial variable to handle large numbers. The core of the code is a for loop that iterates from 1 to n, multiplying the factorial variable by the loop counter in each iteration. The instructor uses a whiteboard to write the mathematical formula for factorial, S! = S * (S-1) * ... * 1, and explains the logic of the loop, showing how the variable 'fact' is updated in each step. He also explains the initialization of the factorial variable to 1 and the importance of this starting value.

  2. 2:00 – 3:19 02:00-03:19

    The instructor continues to explain the factorial calculation, using the whiteboard to demonstrate the step-by-step process for n=5. He shows that the loop runs for i=1, 2, 3, 4, and 5, with the factorial variable being updated as 1*1, 1*2, 2*3, 6*4, and 24*5, resulting in 120. He also explains the special case of 0! = 1, writing '0! = 1' on the board. The video then transitions to a screen recording of an online C compiler. The instructor types the same code into the editor, runs it, and enters the number 5 as input. The console output clearly shows 'Factorial of Number 5 = 120', confirming the correct execution of the program. The instructor concludes by stating that the program has finished with exit code 0, indicating successful completion.

The video effectively teaches the concept of factorial and its implementation in C programming. It follows a clear pedagogical structure: first, it introduces the mathematical concept and the corresponding code. Then, it provides a detailed, step-by-step analysis of the code's logic using a whiteboard, which helps students understand the flow of the for loop. Finally, it reinforces the learning by demonstrating the code's execution in a real environment, showing the correct output. This combination of theory, analysis, and practical demonstration ensures a solid understanding of the topic.

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