Python/C/C++/JAVA

Moderate Practice Programs with Code and Concept

By D.S

Reverse an Array or List

If you want to write a program that displays the Fibonacci sequence, it's actually not too complicated. First off, you'll need to understand what the sequence is - essentially, it's a series of numbers where each number after the first two is the sum of the two preceding ones (e.g. 1, 1, 2, 3, 5, 8...). Once you've got that down pat, you can start coding. Typically this involves using loops and variables to generate each successive value in the sequence until your program reaches whatever endpoint you've specified (either a certain number of iterations or a maximum value for the generated numbers). Whether you're working in a language like Python or C++, there are plenty of resources out there with sample code and tutorials to help guide you through the process. All in all, writing a Fibonacci program can be a fun challenge that pays off with some nifty math-based visualizations!

(a.) C Code

#include <stdio.h>

int main() {
    int n;
    printf("Enter the size of the array: ");
    scanf("%d", &n);

    int arr[n];
    printf("Enter elements of the array:\n");
    for (int i = 0; i < n; ++i) {
        scanf("%d", &arr[i]);
    }

    printf("Reversed array:\n");
    for (int i = n - 1; i >= 0; --i) {
        printf("%d ", arr[i]);
    }
    return 0;
}

Output:-

Enter the size of the array: 5
Enter elements of the array:
1 2 3 4 5
Reversed array:
5 4 3 2 1

(b.) C++ Code

#include <iostream>
using namespace std;

int main() {
    int n;
    cout << "Enter the size of the array: ";
    cin >> n;

    int arr[n];
    cout << "Enter elements of the array:\n";
    for (int i = 0; i < n; ++i) {
        cin >> arr[i];
    }

    cout << "Reversed array:\n";
    for (int i = n - 1; i >= 0; --i) {
        cout << arr[i] << " ";
    }
    return 0;
}

Output:-

Enter the size of the array: 5
Enter elements of the array:
1 2 3 4 5
Reversed array:
5 4 3 2 1

(c.) Python Code

def main():
    n = int(input("Enter the size of the list: "))
    arr = []

    print("Enter elements of the list:")
    for _ in range(n):
        arr.append(int(input()))

    print("Reversed list:")
    for i in range(n - 1, -1, -1):
        print(arr[i], end=" ")

if __name__ == "__main__":
    main()

Output:-

Enter the size of the list: 5
1
2
3
4
5
Reversed list:
5 4 3 2 1

(d.) Java Code

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the size of the array: ");
        int n = scanner.nextInt();

        int[] arr = new int[n];
        System.out.println("Enter elements of the array:");
        for (int i = 0; i < n; ++i) {
            arr[i] = scanner.nextInt();
        }

        System.out.println("Reversed array:");
        for (int i = n - 1; i >= 0; --i) {
            System.out.print(arr[i] + " ");
        }
    }
}

Output:-

Enter the size of the array: 5
Enter elements of the array:
1 2 3 4 5
Reversed array:
5 4 3 2 1