Array Reversal in C | HackerRank Solution

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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 

Solution – 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;
}
Array Reversal in C HackerRank Solution
Array Reversal in C HackerRank Solution

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