Swap. A Swap method exchanges array element values. It acts on 2 separate elements so that they both are still present but in opposite locations.
In the C# language, there is no built-in method for this purpose on most types. You have to implement a custom swap method for string characters and other types.
This example shows how to swap two characters in a string's character buffer. It also shows how to swap two elements in an array with elements of type Int32.
using System;
class Program
{
static void Main()
{
// Swap characters in the string.
string value1 = "abc";
string swap1 = SwapCharacters(value1, 0, 1);
Console.WriteLine(swap1);
// Swap elements in array.
int[] array1 = { 1, 2, 3, 4, 5 };
SwapInts(array1, 0, 1);
foreach (int element in array1)
{
Console.Write(element);
}
Console.WriteLine();
}
static string SwapCharacters(string value, int position1, int position2)
{
// Swaps characters in a string.
char[] array = value.ToCharArray();
char temp = array[position1];
array[position1] = array[position2];
array[position2] = temp;
return new string(array);
}
static void SwapInts(int[] array, int position1, int position2)
{
// Swaps elements in an array.
int temp = array[position1];
array[position1] = array[position2];
array[position2] = temp;
}
}
bac
21345
Exceptions. This code will cause exceptions if you call it with invalid parameters. If needed, you can validate the arguments with if-statements and then throw.
It is possible to develop methods that swap characters in a string or elements in an array. These methods were tested and proven correct on the input provided.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on May 11, 2023 (rewrite).