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    What is an array and its types? Explain in detail - EngineersHub
    Go Back
    Question
    Ruchitha
    1 month ago
    1 Answer(s) posted Write an answer 138
    Answer
    Read Mode
    Answer posted by SaiMukesh Reddy
    1 month ago

    -Arrays are defined in much the same manner as ordinary variables, except that each array name must be accompanied by a size specification (i.e., the number of elements).

    -An array is a collection of variables of the same type that are referred to through a common name. A specific element in an array is accessed by an index.

    -An array is a group of related data items that share a common name.

    -The individual values are called elements. The elements are:  a[0], a[1], a[2] .......a[9].

    -The name of the array(a) contains the address of the first location i.e., a[0].

    -The elements are stored in continuous memory locations during compilation.

    -The elements of the array are physically and logically adjacent. When an array is passed as an argument to a function, its address is actually passed.

    -The lowest address corresponds to the first element and the highest address to the last element.

    -For a one-dimensional array, the size is specified by a positive integer expression(size), enclosed in square brackets. The expression is usually written as a positive integer constant.

    -In general terms, a one-dimensional array definition may be expressed as

      storage_class   data_type   array[ expression] ;

    -The storage-class is optional, default values are automatic(auto) for arrays that are defined within a function or a block, and external( extern)for arrays that are defined outside of a function.

    Eg: Several typical one-dimensional array definitions are shown below.

       int x[100];

      char  text[80];

      static char message[25];

      static float n[12];

    Integer arrays

                                                                                               int a[10];

    /*defines an array a of size 10, as a block of 10 contiguous elements in memory */

        

    Character Arrays

    char name[11];

    -To define a character array, need to define an array of size n+1 characters. This is because all character arrays are terminated by a NULL character (“\0”).

    -Where name[0] through name[9] will contain the characters comprising the name, and name[10] will store the NULL character.

    Types of Arrays

    Basically, arrays can divide into two types. They are:

      1. One Dimensional Array:

      - An array with only one subscript is called a one-dimensional array or 1- d array. It is used to store a list of values, all of which share a common name and are separable by subscript values.

    2. Two Dimensional Array:

      - An array with two subscripts is termed a two-dimensional array.

      - A two-dimensional array, it has a list of given variable-name using two subscripts. We know that a one-dimensional array can store a row of elements, so, a two-dimensional array enables us to store multiple rows of elements.

    One-dimensional Arrays:

    -The general form of declaring a one-dimensional array is

      data_type     array_name [size];

    -Where data-type refers to any data type supported by C, array-name should be a valid C identifier, the size indicates the maximum number of storage locations (elements) that can be stored.

    The general form of initializing an array of one-dimension is as follows:

      data_type     array_name [size] = {list of values};

    -The values in the list are separated by commas.

    -One array is used to store a group of values. A loop (using, for loop) is used to access each value in the group.

    Two-dimensional array:

    -An array with two subscripts is termed a two-dimensional array.  

    Eg:   int a[] [];

    -A two-dimensional array, it has a list of given variable -name using two subscripts. We know that a one-dimensional array can store a row of elements, so, a two-dimensional array enables us to store multiple rows of elements.  

    Eg: A table of elements or a Matrix representation.

    -The syntax of declaring a two-dimensional array is:

      data_type   array_name [rowsize] [ colsize];

    -Row size and column size should be integer constants.

    -Total number of location allocated = (row size * column size).

    -Row-number range from 0 to rowsize-1 and column-number range from 0 to colsize-1.  

    Eg: int m[3] [3];

    Applications of Arrays:

    1. Arrays are used to store a list of values.

    2. Arrays are used to Perform Matrix Operations ( Addition, Multiplication & Transpose)

    3. Arrays are used to implement Search Algorithms. ( Linear Search & Binary Search).

    4. Arrays are used to implement Sorting Algorithms ( Insertion Sort, Bubble Sort, Selection Sort, Quick Sort, Merge Sort, etc.,).

    5. Arrays are used to implement Data structures ( Stacks & Queues).

    6. Arrays are also used to implement CPU Scheduling Algorithms.

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    What is an array and its types? Explain in detail
    X
    What is an array and its types? Explain in detail

    -Arrays are defined in much the same manner as ordinary variables, except that each array name must be accompanied by a size specification (i.e., the number of elements).

    -An array is a collection of variables of the same type that are referred to through a common name. A specific element in an array is accessed by an index.

    -An array is a group of related data items that share a common name.

    -The individual values are called elements. The elements are:  a[0], a[1], a[2] .......a[9].

    -The name of the array(a) contains the address of the first location i.e., a[0].

    -The elements are stored in continuous memory locations during compilation.

    -The elements of the array are physically and logically adjacent. When an array is passed as an argument to a function, its address is actually passed.

    -The lowest address corresponds to the first element and the highest address to the last element.

    -For a one-dimensional array, the size is specified by a positive integer expression(size), enclosed in square brackets. The expression is usually written as a positive integer constant.

    -In general terms, a one-dimensional array definition may be expressed as

      storage_class   data_type   array[ expression] ;

    -The storage-class is optional, default values are automatic(auto) for arrays that are defined within a function or a block, and external( extern)for arrays that are defined outside of a function.

    Eg: Several typical one-dimensional array definitions are shown below.

       int x[100];

      char  text[80];

      static char message[25];

      static float n[12];

    Integer arrays

                                                                                               int a[10];

    /*defines an array a of size 10, as a block of 10 contiguous elements in memory */

        

    Character Arrays

    char name[11];

    -To define a character array, need to define an array of size n+1 characters. This is because all character arrays are terminated by a NULL character (“\0”).

    -Where name[0] through name[9] will contain the characters comprising the name, and name[10] will store the NULL character.

    Types of Arrays

    Basically, arrays can divide into two types. They are:

      1. One Dimensional Array:

      - An array with only one subscript is called a one-dimensional array or 1- d array. It is used to store a list of values, all of which share a common name and are separable by subscript values.

    2. Two Dimensional Array:

      - An array with two subscripts is termed a two-dimensional array.

      - A two-dimensional array, it has a list of given variable-name using two subscripts. We know that a one-dimensional array can store a row of elements, so, a two-dimensional array enables us to store multiple rows of elements.

    One-dimensional Arrays:

    -The general form of declaring a one-dimensional array is

      data_type     array_name [size];

    -Where data-type refers to any data type supported by C, array-name should be a valid C identifier, the size indicates the maximum number of storage locations (elements) that can be stored.

    The general form of initializing an array of one-dimension is as follows:

      data_type     array_name [size] = {list of values};

    -The values in the list are separated by commas.

    -One array is used to store a group of values. A loop (using, for loop) is used to access each value in the group.

    Two-dimensional array:

    -An array with two subscripts is termed a two-dimensional array.  

    Eg:   int a[] [];

    -A two-dimensional array, it has a list of given variable -name using two subscripts. We know that a one-dimensional array can store a row of elements, so, a two-dimensional array enables us to store multiple rows of elements.  

    Eg: A table of elements or a Matrix representation.

    -The syntax of declaring a two-dimensional array is:

      data_type   array_name [rowsize] [ colsize];

    -Row size and column size should be integer constants.

    -Total number of location allocated = (row size * column size).

    -Row-number range from 0 to rowsize-1 and column-number range from 0 to colsize-1.  

    Eg: int m[3] [3];

    Applications of Arrays:

    1. Arrays are used to store a list of values.

    2. Arrays are used to Perform Matrix Operations ( Addition, Multiplication & Transpose)

    3. Arrays are used to implement Search Algorithms. ( Linear Search & Binary Search).

    4. Arrays are used to implement Sorting Algorithms ( Insertion Sort, Bubble Sort, Selection Sort, Quick Sort, Merge Sort, etc.,).

    5. Arrays are used to implement Data structures ( Stacks & Queues).

    6. Arrays are also used to implement CPU Scheduling Algorithms.

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