Array Updation : A Comprehensive Guide

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!