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C# / .NET - iterate string backwards

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Created by:

Mohammad-Oneal

327

In this article, we would like to show you how to iterate string backwards in C#.

Quick solution:

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string text = "ABC";
​
for (int i = text.Length - 1; i >= 0; i--)
{
    Console.WriteLine(text[i]);
}

or:

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string text = "ABC";
​
char[] letters = text.ToCharArray();
​
Array.Reverse(letters);
​
foreach (var letter in letters)
{
    Console.WriteLine(letter);
}

Practical examples

Edit

Example 1

Edit

In this example, we use simple for loop to iterate string backwards.

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using System;
​
public class TestClass
{
    public static void Main()
    {
        string text = "ABC";
​
        for (int i = text.Length - 1; i >= 0; i--)
        {
            Console.WriteLine(text[i]);
        }
    }
}

Output:

xxxxxxxxxx
 
C
B
A

Example 2

Edit

In this example, we split the string into char array - letters, then we use foreach loop to iterate reversed letters array.

xxxxxxxxxx
 
using System;
​
public class TestClass
{
    public static void Main()
    {
        string text = "ABC";
​
        // split string into array
        char[] letters = text.ToCharArray();
​
        // reverse array
        Array.Reverse(letters);
​
        // iterate reversed array
        foreach (var letter in letters)
        {
            Console.WriteLine(letter);
        }
    }
}