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Array Reversal in C HackerRank Solution

Hello Friends in this article i am gone to share Hackerrank C programming Solutions with you. | Array Reversal in C Hackerrank Solution.

Objective

Given an array, of size n, reverse it.
Example: If array, arr = [1, 2, 3, 4, 5], after reversing it, the array should be, arr = [5, 4, 3, 2, 1].

Input Format

The first line contains an integer,n, denoting the size of the array. The next line contains n space-separated integers denoting the elements of the array.

Constraints

1 <= n <= 1000
1 <= arr(i) subset <= 1000, where arr(i)subset is the i(th)superset element of the array.

Output Format

The output is handled by the code given in the editor, which would print the array.

Sample Input 0

6
16 13 7 2 1 12

Sample Output 0

12 1 2 7 13 16

Explanation 0

Given array, arr = [16,13,7,2,1,12]. After reversing the array, arr = [12,1,2,7,13,16].

Sample Input 1

7
1 13 15 20 12 13 2

Sample Output 1

2 13 12 20 15 13 1

Sample Input 2

8
15 5 16 15 17 11 5 11

Sample Output 2

11 5 11 17 15 16 5 15

 


Hackerrank  C programming Solutions

Array Reversal in C Hackerrank Solution

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num, *arr, i;
    scanf("%d", &num);
    arr = (int*) malloc(num * sizeof(int));
    for(i = 0; i < num; i++) {
        scanf("%d", arr + i);
    }


     /* Write the logic to reverse the array. */

    int temp;
    for (i = 0; i < num / 2; i++) {
        temp = (int) *(arr + num - i - 1);
        *(arr + num - i - 1) = *(arr + i);
        *(arr + i) = temp;
    }    
    
    for(i = 0; i < num; i++)
        printf("%d ", *(arr + i));
    return 0;
}

What is array reversal?

The reverse of an array means to change the order of the given array’s elements. This technique reverses the last element of the array into the first one, and the first element becomes the last. However, the process continues until all characters or elements of the array are completely reversed.


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