Computer Programming - Arrays and Strings
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Questions and Answers

What type of data does an array store?

  • Infinite data
  • Dynamic data
  • Heterogeneous data
  • Homogeneous data (correct)
  • How is an array declared in programming?

  • type arrayName { arraySize };
  • type arrayName [ arraySize ]; (correct)
  • arrayName[type](arraySize);
  • arrayName type[arraySize];
  • Which of the following is NOT a characteristic of an array?

  • It stores data sequentially in memory
  • It is a container of data
  • It can hold infinite elements (correct)
  • It must store data of the same type
  • What is meant by dynamic array initialization?

    <p>Values are assigned later during program execution (D)</p> Signup and view all the answers

    Which of the following is an example of static array initialization?

    <p>int marks[] = {90, 86, 89, 76, 91}; (B)</p> Signup and view all the answers

    What is the correct way to access the first element of an array named 'myArray'?

    <p>myArray[0]; (A)</p> Signup and view all the answers

    Which of these statements about arrays is true?

    <p>All elements in an array must be the same data type (A)</p> Signup and view all the answers

    What must be done after declaring an array?

    <p>Initialize its elements (C)</p> Signup and view all the answers

    What is the primary advantage of using arrays in programming?

    <p>They allow for random access of elements using an array index. (B)</p> Signup and view all the answers

    Which of the following is NOT a disadvantage of using arrays?

    <p>They allow for easy traversal and sorting operations. (B)</p> Signup and view all the answers

    How is a one-dimensional array defined in C?

    <p>Using the syntax: datatype array_name[size]; (A)</p> Signup and view all the answers

    What is the index of the last element in an array of size 10?

    <p>9 (A)</p> Signup and view all the answers

    What does the term 'lower bound' refer to in the context of arrays?

    <p>The first valid index of the array. (C)</p> Signup and view all the answers

    What happens when you try to access an index outside the bounds of an array?

    <p>This results in undefined behavior or a runtime error. (D)</p> Signup and view all the answers

    Which type of array allows for multiple dimensions?

    <p>Two-dimensional arrays. (A)</p> Signup and view all the answers

    When managing memory allocation in arrays, which operation can be considered costly?

    <p>Inserting a new element into the array. (A)</p> Signup and view all the answers

    What is the primary purpose of the code presented in the main function?

    <p>To input and print elements of an array. (C)</p> Signup and view all the answers

    Which statement about accessing elements in an array is correct?

    <p>Elements can be accessed using an expression that evaluates to an integer. (C)</p> Signup and view all the answers

    What does a two-dimensional array in C represent?

    <p>A collection of arrays organized in rows and columns. (C)</p> Signup and view all the answers

    In the given C program, what is the result of a[i+j] when i=0 and j=2?

    <p>Accesses the third element of the array. (D)</p> Signup and view all the answers

    What is the correct syntax to declare a two-dimensional array with three rows and four columns?

    <p>int array_name[3][4]; (C)</p> Signup and view all the answers

    Which operation cannot be directly performed on arrays in the given content?

    <p>Change the size of an existing array. (D)</p> Signup and view all the answers

    What is the proper way to initialize a two-dimensional array in C?

    <p>int array_name[3][4] = { {0, 1, 2, 3}, {4, 5, 6, 7}, {8, 9, 10, 11} }; (C)</p> Signup and view all the answers

    Which operation can not be directly observed from the example given?

    <p>Calculating the average of all elements. (C)</p> Signup and view all the answers

    Flashcards

    Array

    A collection of data items of the same type, accessed using a common name. It's a data structure holding a finite, sequential collection of homogeneous data.

    Array - Homogeneous Data

    All elements within an array must be of the same data type.

    Array - Finite size

    An array holds a fixed number of elements defined before use. The size is known at compile time.

    Array Declaration

    Declaring an array involves specifying the data type, name, and size.

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    Static Initialization

    Initializing an array during declaration with values given directly.

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    Dynamic Initialization

    Assigning values to array elements after declaration, during program execution.

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    Array Element

    A single data item within an array, accessed by its index (position).

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    Array - Structure

    Arrays are declared with the data type, a name and square brackets to specify dimensions.

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    Array Declaration Syntax

    Specifying the data type, name, and size of an array.

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    Array Element Access

    Retrieving a specific data item within an array using its index (position) inside square brackets (i.e. []).

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    Array Element Index

    The position of an element in an array, starting from 0 for the first element.

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    Dynamic Array Initialization

    Assigning values to array elements after declaration, during the program's execution.

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    One-dimensional Array

    A linear array where elements are stored sequentially, like a single row.

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    Advantages of Arrays

    1. Less code for multiple elements. 2. Easy random access using index. 3. All elements accessible easily. 4. Simple traversal with a loop. 5. Efficient sorting.
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    Disadvantages of Arrays

    1. Costly insertion/deletion due to memory management. 2. Fixed size limits the number of elements.
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    Why is array index 0?

    The first valid index is 0, known as the lower bound, while the last valid index is the upper bound.

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    Accessing Array Elements

    You can access individual elements within an array using their index, which starts from 0 for the first element.

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    Array Index

    The index of an array element is a numerical value that identifies its position within the array. It starts from 0 for the first element and increases for subsequent elements.

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    How to Input Array Elements?

    To input values into an array, you use a loop to prompt the user for each element and store it at the corresponding index.

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    Printing Array Elements

    You can access and display the values of elements in an array using a loop and accessing each element by its index.

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    Declaring a Two-Dimensional Array

    To declare a two-dimensional array, you specify the data type, name, and the number of rows and columns.

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    Two-Dimensional Array Initialization

    You can initialize a two-dimensional array by providing values for each element in row-wise order within curly braces.

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    Two-Dimensional Array - Example

    A two-dimensional array can be used to represent a grid of numbers, like a game board or a matrix.

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    Study Notes

    Computer Programming - Arrays and Strings

    • Arrays are collections of data items of the same type, accessed by a common name.
    • Arrays hold a finite, sequential collection of homogeneous data.
    • Arrays are containers holding collections of data.
    • Array size is fixed before use.
    • Arrays store data sequentially in memory.
    • Array elements must share the same data type.

    Examples of Array Usage

    • Customer lists with phone numbers
    • Daily rainfall tables
    • Employee lists in an organization
    • Student test scores

    Array Structure

    • Arrays have elements starting from index 0.
    • The index of the last element is one less than the array size.
    • The first index is known as the lower bound.
    • The last index is known as the upper bound.

    Declaring Arrays

    • Array variables are declared like other variables, with an added pair of square brackets specifying the size.
    • Syntax: type arrayName[size]; (e.g., int group[10];)

    Initializing Arrays

    • Static initialization: All elements' values are defined during declaration with curly braces and commas.
      • Example: int marks[5] = {90, 86, 89, 76, 91};
    • Dynamic initialization: Elements are assigned values during program execution.
      • Example: scanf("%d", &arr[i]);

    Advantages of Arrays

    • Efficient use of memory.
    • Easy access to elements using indexing.
    • Simple traversal using loops.
    • Relatively easy to sort.
    • Uses less code than other methods.

    Disadvantages of Arrays

    • Insertion and deletion can be expensive due to memory reallocation needs.
    • Fixed size restricts the amount of data at declaration time..
    • Arrays are not dynamic, unlike linked lists.

    Types of Arrays

    • One-dimensional (single)
    • Two-dimensional
    • Multidimensional

    One-Dimensional Arrays

    • Elements are stored sequentially, like a row.
    • Syntax: datatype array_name[size]

    Accessing Array Elements

    • Elements are accessed using their index, inside square brackets.
    • Index starts from 0.

    Matrix Operations

    • Matrices store data in rows and columns.
    • Basic matrix operations include addition, subtraction, and multiplication.
    • Matrix multiplication is common in programs.

    Matrix Initialization

    • Two Methods: Direct initialization at declaration or assigning values individually.

    Matrix Accessing

    • Elements within a matrix can be accessed by specifying row and column indices.

    Programs for Array, Matrix Operations

    • Programs demonstrating various functions are present in the slides.

    Strings

    • Strings are sequences of characters treated as a single data item.
    • Strings are enclosed in double quotes. ("...")

    String Declaration

    • String declaration mirrors array declaration.
    • Syntax: char stringName[size];

    String Initialization

    • String initialization values end with '\0' (null character)—additional characters will be ignored.

    Reading Strings

    • The %s format specifier is used to read strings.

    Assigning Values to Strings

    • String variables cannot be assigned directly after declaration.

    String Handling Functions

    • C has various functions (e.g., strlen, strcpy, strcmp, strcat, strrev, strlwr, strupr, strstr) to manipulate strings.
    • These functions are found in the string.h header file. These functions need to be included in your programs to utilize their functionality.

    Example Programs and Functionalities (in code style)

    • Example shows common tasks and their respective syntaxes/functions (e.g., length calculation, copying, concatenation).

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    Description

    This quiz covers the fundamental concepts of arrays and strings in computer programming. Learn how to declare, initialize, and utilize arrays effectively in your coding practices. Explore various applications and structures of arrays through practical examples.

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