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    Lesson 1 Introduction To Array

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    Camille S. Santiago
    This document provides an introduction to arrays in C++. It defines an array as a collection of items of the same data type stored contiguously in memory that can be referenced using a single variable name and integer indexes. The document explains that arrays allow grouping of multiple values under one name, and that each element in an array has a unique index/subscript that is used to access it. It also covers declaring, initializing, and using arrays through examples of C++ code statements.

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    Lesson 1 Introduction To Array

    Uploaded by

    Camille S. Santiago
    30 views10 pages
    This document provides an introduction to arrays in C++. It defines an array as a collection of items of the same data type stored contiguously in memory that can be referenced using a single variable name and integer indexes. The document explains that arrays allow grouping of multiple values under one name, and that each element in an array has a unique index/subscript that is used to access it. It also covers declaring, initializing, and using arrays through examples of C++ code statements.

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    Lesson 1 Introduction to Array

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    This document provides an introduction to arrays in C++. It defines an array as a collection of items of the same data type stored contiguously in memory that can be referenced using a single variable name and integer indexes. The document explains that arrays allow grouping of multiple values under one name, and that each element in an array has a unique index/subscript that is used to access it. It also covers declaring, initializing, and using arrays through examples of C++ code statements.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    30 views10 pages

    Lesson 1 Introduction To Array

    Uploaded by

    Camille S. Santiago
    This document provides an introduction to arrays in C++. It defines an array as a collection of items of the same data type stored contiguously in memory that can be referenced using a single variable name and integer indexes. The document explains that arrays allow grouping of multiple values under one name, and that each element in an array has a unique index/subscript that is used to access it. It also covers declaring, initializing, and using arrays through examples of C++ code statements.

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    © All Rights Reserved
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    UNIT 2

    Array

    IT 105 Computer Programming 2


    Lesson 1
    Introduction to Array

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    What is an Array?
    An array allows you to store a group of items of the same data type together
    in memory.

    The contents of an array are stored in contiguous memory.

    It is special type of variable that can contain or hold one or more values of
    the same data type with reference to only one variable name.

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    Array Elements and Subscripts
    The data items in an array are referred to as elements.

    Each element is assigned a unique number known as subscript or index.

    It can be individually referenced by specifying the index inside the square


    brackets [ ].

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    Array Elements and Subscripts

    num [0] [1] [2] [3] [4]

    // num is an array variable of five elements

    Each element can be referred to as :

    num[0] num[1] num[2] num[3] num[4]

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    Declaration of Array

    data type arrayname [elements];

    int num [5];

    Note: In a fixed-length array, the size of the array is


    constant and must have a value at compilation time.

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    Initialization of Array
    An array can be initialized when it is declared ,when initializing the array, the
    value for their various indexed variables are enclosed in braces and separated by
    commas.
    int num[5] = {10,20,30,40,50};
    0 1 2 3 4

    10 20 30 40 50

    char choice[5] = { ‘a’,’b’,’c’,’d’,’e’};

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    Initialization of Array
    num[0] = 10 ; choice[0] = ‘a’ ;
    num[1] = 20 ; choice[1] = ‘b’ ;
    num[2] = 30 ; choice[2] = ‘c’ ;
    num[3] = 40 ; choice[3] = ‘d’ ;
    num[4] = 50 ; choice[4] = ‘e’ ;
    Initialization without size
    int num[] = {10,20,30,40,50};

    Partial initialization
    int num[5] = {10,20}; (The rest are filled with 0’s)

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    Sample C++ Statements using Array
    single variable array
    num = 20 ; num[0] = 20 ;
    num[x] = 20 ;
    num[x-1]= 20 ;
    a = a + 1 ; a[1] = a[1] + 1 ;

    c = a + b ; c = a[1] + b[2] ;

    c[0]= a[1]+b[2] ;

    IT 105 Computer Programming 2


    LESSON 1 Introduction to Array
    Sample C++ Statements using Array
    single variable array
    cin>>x; cin>>x[0];

    cout<<x; cout<<x[1];

    if (grade ›=75) if (grade[3] ›=75)


    { {
    cout<<“passed”; cout<<“passed”;
    } }

    IT 105 Computer Programming 2

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