Chapter 6: Vectors Flashcards

What assigns element 0 with the value 250?

What assigns element 1 with the value 99?

What is the value of peoplePerDay after these statements: peoplePerDay = 5; peoplePerDay = peoplePerDay - 3;

What is the value of peoplePerDay given: peoplePerDay[N] = 15; N = N + 1; peoplePerDay[N] = peoplePerDay[N - 1] * 3?

Assign the first element in scoresList with 77.

Assign the second element in scoresList with 77.

Assign the last element in scoresList with 77.

If the array has 100 elements, what is the last element's index?

If the array's last index was 499, how many elements does the array have?

How many elements does the vector yearsList(4) create?

What value is assigned into yearsList.at(1)?

What value does curr = yearsList.at(2) assign to curr?

Is curr = yearsList.at(4) a valid assignment?

What is the proper way to access the first element in vector yearsList?

What are the contents of the vector after yearsList.at(0) = yearsList.at(2)?

Array Basics

An array peoplePerDay has 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] = 250 assigns the first element the value 250.
peoplePerDay[1] = 99 assigns 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 in peoplePerDay holding a value of 2.

Indexed Assignments

For peoplePerDay[N] = 15;, if N starts at 1, the first assignment initializes peoplePerDay[1] to 15.
The subsequent assignment peoplePerDay[N] = peoplePerDay[N - 1] * 3; results in peoplePerDay[2] = 45.

Accessing Array Elements

The first element of an array scoresList initialized with 10 elements is accessed via scoresList[0].
The last element of a 10-element array is scoresList[9].

Array Indices

For an array of size N, the last index is N - 1.
An array with a last index of 499 has 500 elements.

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) = 2012 assigns the second element the value 2012.
Using curr = yearsList.at(2) assigns curr the value 2025.

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 to 2025, resulting in the vector contents being 2025, 2012, 2025, 0.

Summary of Valid Indices

Only indices 0 to 3 are valid for a vector of size 4.

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.