Introduction

Arrays are fundamental data structures in programming, allowing us to store and manipulate collections of elements. In this blog post, we will explore different methods of updating arrays in C++. Specifically, we'll focus on updating elements at the end, at the beginning, and at a specific position (k-th position) within an array.

Updating Array at the End

Updating an array at the end involves modifying the last element of the array.

Pseudocode

function updateArrayAtEnd(array, newValue):
    array[length(array) - 1] = newValue

C++ Program

#include <iostream>
using namespace std;

int main() {
    const int size = 5;
    int arr[size] = {1, 2, 3, 4, 5};

    // Update array at the end
    int newValue = 10;
    arr[size - 1] = newValue;

    // Display the updated array
    cout << "Updated Array at the End: ";
    for (int i = 0; i < size; i++) {
        cout << arr[i] << " ";
    }

    return 0;
}

Updating Array at the Beginning

Updating an array at the beginning involves modifying the first element of the array.

Pseudocode

function updateArrayAtBeginning(array, newValue):
    array[0] = newValue

C++ Program

#include <iostream>
using namespace std;

int main() {
    const int size = 5;
    int arr[size] = {1, 2, 3, 4, 5};

    // Update array at the beginning
    int newValue = 10;
    arr[0] = newValue;

    // Display the updated array
    cout << "Updated Array at the Beginning: ";
    for (int i = 0; i < size; i++) {
        cout << arr[i] << " ";
    }

    return 0;
}

Updating Array at a Specific Position (k-th Position)

Updating an array at a specific position involves modifying the element at a given index (k-th position).

Pseudocode

function updateArrayAtKPosition(array, k, newValue):
    array[k] = newValue

C++ Program

#include <iostream>
using namespace std;

int main() {
    const int size = 5;
    int arr[size] = {1, 2, 3, 4, 5};

    // Update array at a specific position (3rd position in this case)
    int k = 2; // Note: Arrays are zero-indexed
    int newValue = 10;
    arr[k] = newValue;

    // Display the updated array
    cout << "Updated Array at Position " << k + 1 << ": ";
    for (int i = 0; i < size; i++) {
        cout << arr[i] << " ";
    }

    return 0;
}

Conclusion

In this blog post, we covered different methods of updating arrays in C++. Understanding how to update elements at the end, at the beginning, and at specific positions is crucial for efficient array manipulation in various programming scenarios. Happy coding!