PD1: Chapter 5: Iterations

• What is the generic List datatype in C#?

  A generic collection datatype that contains a dynamic number of elements
• What is required to complete the generic List datatype?

  An extra datatype known as the Type parameter
• What are examples of List datatypes in C#?

  List<int>, List<string>, List<float>

  
• How does the datatype inside a List affect its elements?

  It specifies which datatype the elements in the list adhere to
• What notation is used to retrieve an item at a specific position in a List?

  Square brackets notation []
• What is the term for the squared bracket notation used in Lists?

  Indexer
• What method can be used to remove all elements from a List?

  The Clear method
• How does the capacity of a List change when elements are added?

  It grows dynamically as needed
• What is the purpose of iteration statements in C#?

  To execute commands multiple times
• What must be written between parentheses in a while statement?

  The test condition
• What happens if the test in a while statement fails immediately?

  The code block is not executed
• What is a potential risk of a while loop if the test is always true?

  It can lead to an infinite loop
• When is a while loop particularly useful?

  When the number of iterations is not known in advance
• What does the second while loop in the practical example do?

  Generates random numbers until the secret number is found

  
• What happens if the user provides a number outside the range [0-20]?

  The program will never find a solution
• How does a do statement differ from a while statement?

  The test comes after the code block in a do statement
• What is a benefit of using a do statement?

  The code block is executed at least once
• What is the structure of a for statement in C#?

  It contains a for keyword with three control elements
• What are the three control elements in a for statement?

  Initializer, test condition, and increment
• What is the significance of the control variable in a for loop?

  It is used to process elements related to the loop
• What does it mean that positions in a list are 0 based?

  The first index is 0, meaning indices range from 0 to count-1
• What is the purpose of the foreach instruction?

  To process each element in a collection automatically
• What does the break keyword do in a loop?

  It moves control to the first instruction after the loop
• What is the function of the continue keyword in a loop?

  It halts the current iteration and starts the next one
• What is the yield keyword used for?

  To simulate collection behavior without providing the collection
• Why is it not allowed to delete an item from a List using a foreach statement?

  It causes a runtime error

  
• What happens if you try to delete items from a List while iterating through it?

  Only half the elements may be removed

  
• What is the recommended method to delete all items in a List?

  Use the Clear method
• What is the relationship between while and for statements?

  Each can perform the same logic
• What must be included in a for loop to avoid an infinite loop?

  A break or return statement
• What are the key features of the List datatype in C#?

  • Generic collection datatype
  • Dynamic number of elements
  • Requires a Type parameter
  • Supports indexers for element retrieval
  • Allows various operations using dot-notation
  • Supports Clear method to remove all elements
  • Dynamic capacity that grows as needed

  
• What are the types of iteration statements in C#?

  1. while statement
  2. do statement
  3. for statement
  4. foreach statement
• What are the differences between while, do, and for statements?

  • while: test condition before executing code block
  • do: test condition after executing code block
  • for: includes initialization, test condition, and increment in one line
• What are the uses of break, continue, and yield keywords in loops?

  • break: exits the loop
  • continue: skips to the next iteration
  • yield: simulates collection behavior without a complete collection
• What are the methods for deleting elements in a List?

  • Use Clear method to remove all elements
  • Avoid deleting while iterating with foreach
  • Use a for loop to remove specific elements