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    How can we declare and initialize 2D arrays? Explain with examples.? - EngineersHub
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    Question
    Naseem Shaik
    3 years ago
    1 Answer(s) posted Write an answer 5290
    Answer
    Read Mode
    Answer posted by Vinod Raj
    3 years ago

    An array consisting of two subscripts is known as a two-dimensional array. These are often known as an array of the array. In two-dimensional arrays, the array is divided into rows and columns. These are well suited to handle a table of data. In a 2-D array, we can declare an array as :

    Declaration:-

    Syntax: data_type array_name[row_size][column_size];

    Ex:- int arr[3][3];

    where the first index value shows the number of the rows and the second index value shows the number

    of the columns in the array.

    Initializing two-dimensional arrays:

    Like the one-dimensional arrays, two-dimensional arrays may be initialized by following their declaration with a list of initial values enclosed in braces.

    Ex: int a[2][3]={0,0,0,1,1,1}; initializes the elements of the first row to zero and the second row to one. The initialization is done row by row. 

    above statement can also be written as

    int a[2][3] = {{ 0,0,0},{1,1,1}};

    by surrounding the elements of each row by braces.

    We can also initialize a two-dimensional array in the form of a matrix as shown below

    int a[2][3]={

    {0,0,0},

    {1,1,1}

    };

    When the array is completely initialized with all values, explicitly we need not specify the size of the first dimension.

    Ex: int a[][3]={

    {0,2,3},

    {2,1,2}

    };

    If the values are missing in an initializer, they are automatically set to zero.

    Ex: int a[2][3]={

    {1,1},

    {2}

    };

    Will initialize the first two elements of the first row to one, the first element of the second row to two, and all other elements to zero.

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    How can we declare and initialize 2D arrays? Explain with examples.?
    X
    How can we declare and initialize 2D arrays? Explain with examples.?

    An array consisting of two subscripts is known as a two-dimensional array. These are often known as an array of the array. In two-dimensional arrays, the array is divided into rows and columns. These are well suited to handle a table of data. In a 2-D array, we can declare an array as :

    Declaration:-

    Syntax: data_type array_name[row_size][column_size];

    Ex:- int arr[3][3];

    where the first index value shows the number of the rows and the second index value shows the number

    of the columns in the array.

    Initializing two-dimensional arrays:

    Like the one-dimensional arrays, two-dimensional arrays may be initialized by following their declaration with a list of initial values enclosed in braces.

    Ex: int a[2][3]={0,0,0,1,1,1}; initializes the elements of the first row to zero and the second row to one. The initialization is done row by row. 

    above statement can also be written as

    int a[2][3] = {{ 0,0,0},{1,1,1}};

    by surrounding the elements of each row by braces.

    We can also initialize a two-dimensional array in the form of a matrix as shown below

    int a[2][3]={

    {0,0,0},

    {1,1,1}

    };

    When the array is completely initialized with all values, explicitly we need not specify the size of the first dimension.

    Ex: int a[][3]={

    {0,2,3},

    {2,1,2}

    };

    If the values are missing in an initializer, they are automatically set to zero.

    Ex: int a[2][3]={

    {1,1},

    {2}

    };

    Will initialize the first two elements of the first row to one, the first element of the second row to two, and all other elements to zero.

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