Reverse of an Array in C

March 29, 2023

Reverse of an array in C Programming Language

On this page, we will look into a coding question where we will learn how to reverse the array in C Programming Language. There might be different approaches to solve this question, one you will find here. If your approach is a bit different post it in the comment section.

introduction to arrays in V

Reverse of an Array In C

In C programming language, an array is a collection of elements of the same type stored in contiguous memory locations. To reverse an array in C, you need to swap the elements of the array in a specific order.

One way to reverse an array is to use two pointers, one pointing to the first element of the array and the other pointing to the last element of the array. Then, swap the elements at the two pointers and move the pointers towards each other until they meet at the middle of the array.

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Algorithm:

  1. Initialize two pointers start_ptr and end_ptr to the first and last elements of the array, respectively.
  2. While start_ptr is less than end_ptr, do the following:
    1. Swap the elements pointed to by start_ptr and end_ptr.
    2. Increment start_ptr by 1.
    3. Decrement end_ptr by 1.
  3. When the loop terminates, the array will be reversed.

Program for reversing an array in C

Run

#include<stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    int arr[n];
    int temp;
    for(int i=0; i<n; i++)
    {
        scanf("%d",&arr[i]);
    }
    for(int i=0; i<n/2; i++)
    {
        temp = arr[i];
        arr[i] = arr[n-i-1];
        arr[n-1-i] = temp;
    }
    for(int i=0; i<n; i++)
    {
        printf("%d ",arr[i]);   
    }
    return 0;
}

Output:

5
2 5 1 4 3
3 4 1 5 2

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Introduction to Trees

Binary Trees

Binary Search Trees

Traversals

  • Traversal in Trees
  • Tree Traversals: Breadth-First Search (BFS) : C | C++ | Java
  • Tree Traversals: Depth First Search (DFS) : C | C++ | Java
  • Construct a Binary Tree from Postorder and Inorder

B – Trees

AVL Trees

  • AVL Trees
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    • AVL Tree Deletion : C | C++ | Java
    • Insertion in a Binary Tree (Level Order) – C | C++ | Java
    • Searching in Binary Tree – C | C++ | Java
    • Searching in a Binary Search Tree – C | C++ | Java

Complete Programs for Trees

  • Depth First Traversals – C | C++ | Java
  • Level Order Traversal – C | C++ | Java
  • Construct Tree from given Inorder and Preorder traversals – C | C++ | Java
  • Construct Tree from given Postorder and Inorder traversals – C | C++ | Java
  • Construct Tree from given Postorder and Preorder traversal – C | C++ | Java
  • Find size of the Binary tree – C | C++ | Java
  • Find the height of binary tree – C | C++ | Java
  • Find maximum in binary tree – C | C++ | Java
  • Check whether two tree are identical- C| C++| Java
  • Spiral Order traversal of Tree- C | C++| Java
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  • Hand shaking lemma and some Impotant Tree Properties.
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  • Sum of all nodes in Binary Tree- C | C++ | Java
  • Lowest Common Ancestor in Binary Tree- C | C++ | Java

Introduction to Trees

Binary Trees

Binary Search Trees

Traversals

  • Traversal in Trees
  • Tree Traversals: Breadth-First Search (BFS) : C | C++ | Java
  • Tree Traversals: Depth First Search (DFS) : C | C++ | Java
  • Construct a Binary Tree from Postorder and Inorder

B – Trees

AVL Trees

  • AVL Trees
    • AVL Trees: Introduction
    • AVL Tree Insertion :  C | C++ | Java
    • AVL Tree Deletion : C | C++ | Java
    • Insertion in a Binary Tree (Level Order) – C | C++ | Java
    • Searching in Binary Tree – C | C++ | Java
    • Searching in a Binary Search Tree – C | C++ | Java

Complete Programs for Trees

  • Depth First Traversals – C | C++ | Java
  • Level Order Traversal – C | C++ | Java
  • Construct Tree from given Inorder and Preorder traversals – C | C++ | Java
  • Construct Tree from given Postorder and Inorder traversals – C | C++ | Java
  • Construct Tree from given Postorder and Preorder traversal – C | C++ | Java
  • Find size of the Binary tree – C | C++ | Java
  • Find the height of binary tree – C | C++ | Java
  • Find maximum in binary tree – C | C++ | Java
  • Check whether two tree are identical- C| C++| Java
  • Spiral Order traversal of Tree- C | C++| Java
  • Level Order Traversal LIne by Line – C | C++| Java
  • Hand shaking lemma and some Impotant Tree Properties.
  • Check If binary tree if Foldable or not.- C| C++| Java
  • check whether tree is Symmetric  C| C++| Java.
  • Check for Children-Sum in Binary Tree- C|C++| Java
  • Sum of all nodes in Binary Tree- C | C++ | Java
  • Lowest Common Ancestor in Binary Tree. C | C++ | Java