Write a method swaparrayends () that swaps the first and last elements of its array parameter. ex: sortarray = {10, 20, 30, 40} becomes {40, 20, 30, 10}. the array's size may differ from 4.

In the C programming language, you can't determine the array size from the parameter, so you have to pass it in as an extra parameter. The solution could be:

#include

void swaparrayends (int arr[], int nrElements)

{

int temp = arr[0];

arr[0] = arr[nrElements - 1];

arr[nrElements - 1] = temp;

}

void main ()

{

int i;

int myArray[] = { 1,2,3,4,5 };

int nrElements = sizeof (myArray) / sizeof (myArray[0]);

swaparrayends (myArray, nrElements);

for (i = 0; i < nrElements; i++)

{

printf ("%d ", myArray[i]);

}

getchar ();

}

In higher languages like C# it becomes much simpler:

static void Main (string[] args)

{

int[] myArray = {1, 2, 3, 4, 5};

swaparrayends (myArray);

foreach (var el in myArray)

{

Console. Write (el + " ");

}

Console. ReadLine ();

}

static void swaparrayends (int[] arr)

{

int temp = arr[0];

arr[0] = arr. Last ();

arr[arr. Length - 1] = temp;

}