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    Computer Programming: Lecture 3 - 2 Dimensional & Multi Dimensional Arrays

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    Muhammad Naffah Amin
    The document discusses two-dimensional and multi-dimensional arrays, explaining that two-dimensional arrays use multiple subscripts to represent tables with rows and columns, and can be initialized with values grouped by row in curly braces; it also provides an example of a function that prints the values of a two-dimensional array using nested for loops to iterate through each row and column.

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    Computer Programming: Lecture 3 - 2 Dimensional & Multi Dimensional Arrays

    Uploaded by

    Muhammad Naffah Amin
    39 views7 pages
    The document discusses two-dimensional and multi-dimensional arrays, explaining that two-dimensional arrays use multiple subscripts to represent tables with rows and columns, and can be initialized with values grouped by row in curly braces; it also provides an example of a function that prints the values of a two-dimensional array using nested for loops to iterate through each row and column.

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    The document discusses two-dimensional and multi-dimensional arrays, explaining that two-dimensional arrays use multiple subscripts to represent tables with rows and columns, and can be initialized with values grouped by row in curly braces; it also provides an example of a function that prints the values of a two-dimensional array using nested for loops to iterate through each row and column.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    39 views7 pages

    Computer Programming: Lecture 3 - 2 Dimensional & Multi Dimensional Arrays

    Uploaded by

    Muhammad Naffah Amin
    The document discusses two-dimensional and multi-dimensional arrays, explaining that two-dimensional arrays use multiple subscripts to represent tables with rows and columns, and can be initialized with values grouped by row in curly braces; it also provides an example of a function that prints the values of a two-dimensional array using nested for loops to iterate through each row and column.

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    1

    Computer Programming
    Lecture 3 2 Dimensional & Multi Dimensional Arrays

    8/24/2015

    Outline
    2- Dimensional Arrays
    How to Initialize?
    How to pass to Functions?

    Multi- Dimensional

    8/24/2015

    Two - Dimensional Arrays


    Multiple subscripts
    a[ i ][ j ]

    Tables with rows and columns


    Specify row, then column
    Array of arrays
    a[1][4] is an array of 4 elements

    a[0][0] is the first element of that array


    Column 0

    Column 1

    Column 2

    Column 3

    Row 0

    a[ 0 ][ 0 ]

    a[ 0 ][ 1 ]

    a[ 0 ][ 2 ]

    a[ 0 ][ 3 ]

    Row 1

    a[ 1 ][ 0 ]

    a[ 1 ][ 1 ]

    a[ 1 ][ 2 ]

    a[ 1 ][ 3 ]

    Row 2

    a[ 2 ][ 0 ]

    a[ 2 ][ 1 ]

    a[ 2 ][ 2 ]

    a[ 2 ][ 3 ]

    Column subscript
    Array name
    Row subscript

    Two - Dimensional Arrays


    To initialize
    Default of 0

    Initializers grouped by row in braces

    int b[ 2 ][ 2 ] = { { 1, 2 }, { 3, 4 } };

    int b[ 2 ][ 2 ] = { { 1 }, { 3, 4 } };

    1
    3

    Row 0
    Row 1

    2
    4

    1
    3

    0
    4

    Two - Dimensional Arrays


    Referenced like normal
    cout << b[ 0 ][ 1 ];

    Outputs 0

    1
    3

    0
    4

    Cannot reference using commas


    cout << b[ 0, 1 ];

    Syntax error

    Function prototypes
    Must specify sizes of column rows not necessary
    void printArray( int [][ 3 ] );

    // Initializing multidimensional arrays.


    #include <iostream>
    using namespace std;

    Note the format of the


    prototype.

    void printArray( int [][ 3 ] );


    int main()

    {
    int array1[ 2 ][ 3 ] = { { 1, 2, 3 }, { 4, 5, 6 } };
    int array2[ 2 ][ 3 ] = { 1, 2, 3, 4, 5 };
    int array3[ 2 ][ 3 ] = { { 1, 2 }, { 4 } };
    cout << "Values in array1 by row are:" << endl;
    printArray( array1 );
    cout << "Values in array2 by row are:" << endl;
    printArray( array2 );
    cout << "Values in array3 by row are:" << endl;
    printArray( array3 );
    return 0; // indicates successful termination
    } // end main

    Note the various


    initialization styles. The
    elements in array2 are
    assigned to the first row
    and then the second.

    // function to output array with two rows and three columns

    For loops are often used to


    iterate through arrays.
    {
    Nested loops are helpful
    with multiple-subscripted
    for ( int i = 0; i < 2; i++ ) { // for each row
    for ( int j = 0; j < 3; j++ ) // output column values arrays.
    void printArray( int a[][ 3 ] )

    cout << a[ i ][ j ] << ' ';


    cout << endl; // start new line of output
    } // end outer for structure

    } // end function printArray


    Values in array1 by row are:
    1 2 3
    4 5 6
    Values in array2 by row are:
    1 2 3
    4 5 0
    Values in array3 by row are:
    1 2 0
    4 0 0

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