one dimensional array

1. An Introduction to Programming with C++
Eighth Edition
Lesson 11:
One – Dimensional Array

2. Chapter Objectives
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An Introduction to Programming with C++, Eighth Edition 2
• Declare and initialize a one-dimensional array
• Enter data into a one-dimensional array
• Display the contents of a one-dimensional array
• Pass a one-dimensional array to a function
• Calculate the total and average of the values in a one-
dimensional array
• Search a one-dimensional array
• Access an individual element in a one-dimensional array
• Find the highest value in a one-dimensional array
• Use parallel one-dimensional arrays
• Explain the bubble sort algorithm

3. The Concept of Array
You already are familiar with the concept of grouping.
The clothes in your closet are probably separated into
groups, such as coats, sweaters, shirts, and so on.
Grouping your clothes in this manner allows you to easily
locate your favorite sweater because you only need to
look through the sweater group rather than through the
entire closet. You may also have the songs on your MP3
player grouped by either music type or artist. If the songs
are grouped by artist, it will take only a few seconds to
find all of your Katy Perry songs and, depending on the
number of Katy Perry songs you own, only a short time
after that to locate a particular song.

4. What is an Array?
• When you group together related variables that
have the same data type, the group is referred to
as an array of variables or, more simply, an
ARRAY
• An array is a collection of one or more values of the
same type. Each value is called an element of the
array. The elements of the array share the same
variable name but each element has its own unique
index number (also known as a subscript). An array
can be of any type, For example: int, float, char etc. If
an array is of type int then it's elements must be of
type int only.

5. One – Dimensional Array
Conceptually you can think of a one-dimensional
array as a row, where elements are stored one after
another.

6. Syntax: datatype array_name[size];
datatype: It denotes the type of the
elements in the array.
array_name: Name of the array. It must be
a valid identifier.
size: Number of elements an array can
hold. here are some example of array
declarations:
Declaring and Initializing a one
dimensional array.

7. You can initialize the array elements at the same time
you declare the array. You do this by entering one or
more values, separated by commas, in the
initialValues section of the syntax. You enclose the
initialValues section in braces ({}),like
datatype array_name[size] = {1,2,3}
Populating the array- is the assigning initial values to
an array.
Declaring and Initializing a one
dimensional array.

8. Declaring and Initializing a one
dimensional array.

9. Declaring and Initializing a one
dimensional array.

10. Entering Data into a One-
Dimensional Array
Note:
Subscript also
called as index or
number of
element

11. Entering Data into a One-
Dimensional Array
Note:
Subscript also called as index or
number of element

12. Entering Data into a One-
Dimensional Array
• You can also use the extraction operator to store data in an array
element, as shown in the syntax and examples in Figure 11-4. (The
arrays in Figure 11-4 were declared earlier in Figure 11-2.)
• The cin statement in Example 1 stores the user’s entry in the first
element in the letters array, replacing the element’s existing data.
• Example 2 contains a for loop that repeats its instructions four times:
once for each element in the sales array.
• The loop instructions prompt the user to enter a sales amount and
then store the user’s response in the current element.
• Example 3 contains a while loop that repeats its instructions for each
of the six elements in the numbers array.
• The loop instructions prompt the user to enter an integer and then
store the user’s response in the current element.

13. Use the extraction operator to store
data in an array element

14. Use the extraction operator to store
data in an array element

15. Displaying the Contents of
a One-Dimensional Array
To display the contents of an array, you need to access each of its
elements. You do this using a loop along with a counter variable that
keeps track of each subscript in the array.

16. Displaying the Contents of
a One-Dimensional Array

17. Example Program(Calories
Program)
Note:
Try to copy the
code and try to
debug

18. Example Program(Calories
Program)
Possible Output:

19. Passing a One-Dimensional Array
to a Function

20. Passing a One-Dimensional Array
to a Function
Continue:

21. Passing a One-Dimensional Array
to a Function (Calculating a Total and an Average)
OUTPUT:

22. Passing a One-Dimensional Array
to a Function (Finding the highest value)

23. Displays the annual membership
fee

24. Key Terms:
• Array—a group of related variables that have the
same name and data type
• Bubble sort—one of many sorting algorithms
used to sort small arrays; works by comparing
adjacent array elements and swapping the ones
that are out of order
• Elements—the variables in an array One-
dimensional array—an array whose elements are
identified by a unique subscript
• Parallel arrays—two or more arrays whose
elements are related by their corresponding
position (subscript) in the arrays

25. Key Terms:
• Populating the array—the process of initializing
the elements in an array
• Scalar variable—another term for a simple
variable
• Simple variable—a variable that is unrelated to
any other variable in the computer’s internal
memory; also called a scalar variable
• Sorting—the process of arranging data in a
specific order
• Subscript—a unique number that identifies the
position of an element in an array