Questions and Answers
What assigns element 0 with the value 250?
peoplePerDay = 250
What assigns element 1 with the value 99?
peoplePerDay = 99
What is the value of peoplePerDay after these statements: peoplePerDay = 5; peoplePerDay = peoplePerDay - 3;
2
What is the value of peoplePerDay given: peoplePerDay[N] = 15; N = N + 1; peoplePerDay[N] = peoplePerDay[N - 1] * 3?
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Assign the first element in scoresList with 77.
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Assign the second element in scoresList with 77.
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Assign the last element in scoresList with 77.
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If the array has 100 elements, what is the last element's index?
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If the array's last index was 499, how many elements does the array have?
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How many elements does the vector yearsList(4) create?
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What value is assigned into yearsList.at(1)?
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What value does curr = yearsList.at(2) assign to curr?
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Is curr = yearsList.at(4) a valid assignment?
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What is the proper way to access the first element in vector yearsList?
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What are the contents of the vector after yearsList.at(0) = yearsList.at(2)?
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Study Notes
Array Basics
- An array
peoplePerDayhas 365 elements corresponding to each day of the year. - To assign a value to an array element, use the format
array[index] = value;.
Assigning Values
-
peoplePerDay[0] = 250assigns the first element the value 250. -
peoplePerDay[1] = 99assigns the second element the value 99.
Arithmetic Operations
- If an element's value is modified through arithmetic, e.g.,
peoplePerDay = 5; peoplePerDay -= 3;, it results inpeoplePerDayholding a value of2.
Indexed Assignments
- For
peoplePerDay[N] = 15;, ifNstarts at 1, the first assignment initializespeoplePerDay[1]to 15. - The subsequent assignment
peoplePerDay[N] = peoplePerDay[N - 1] * 3;results inpeoplePerDay[2] = 45.
Accessing Array Elements
- The first element of an array
scoresListinitialized with 10 elements is accessed viascoresList[0]. - The last element of a 10-element array is
scoresList[9].
Array Indices
- For an array of size
N, the last index isN - 1. - An array with a last index of
499has500elements.
Vector Basics
- A vector
yearsList(4)initializes four elements, which can be accessed using the.at(index)method. - Each
yearsList.at(index)corresponds to the element at that position within the vector.
Vector Assignments
-
yearsList.at(1) = 2012assigns the second element the value 2012. - Using
curr = yearsList.at(2)assignscurrthe value2025.
Validity of Access
- Attempting to access
yearsList.at(4)results in an error since valid indices for four elements are 0, 1, 2, and 3.
Accessing First Element
- The first element can be accessed with
yearsList.at(0).
Content Changes
- Assigning
yearsList.at(0) = yearsList.at(2)changes the first element to2025, resulting in the vector contents being2025, 2012, 2025, 0.
Summary of Valid Indices
- Only indices
0to3are valid for a vector of size4.
Studying That Suits You
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Description
Test your understanding of vectors with these flashcards covering participation activities from Chapter 6. Each card presents an array-related question, helping reinforce your grasp of the material. Perfect for review and preparation before exams.
