How to Convert Numbers to Ordinal Forms (1st, 2nd, 3rd, etc.) in C#?

Number ordinal conversion in C#

In C#, the string formatting function does not directly support ordinal numbers. To convert a number into ordinal form, you need to use a custom function.

<code class="language-csharp">public static string AddOrdinal(int num)
{
    if (num <= 0) return num.ToString();

    string suffix = "th";
    int lastDigit = num % 10;
    int lastTwoDigits = num % 100;

    if (lastDigit == 1 && lastTwoDigits != 11) suffix = "st";
    else if (lastDigit == 2 && lastTwoDigits != 12) suffix = "nd";
    else if (lastDigit == 3 && lastTwoDigits != 13) suffix = "rd";

    return num + suffix;
}</code>

This function handles ordinal numbers of numbers less than or equal to zero, and provides different suffixes for different cases (e.g., 1st, 2nd, 3rd, etc.).

Usage:

<code class="language-csharp">int num = 5;
string ordinalForm = AddOrdinal(num);
Console.WriteLine(ordinalForm); // 输出：5th</code>

Note:

• Numbers less than or equal to zero have no ordinal number, so this function handles such cases accordingly.
• This function is not internationalized, which means it only supports English ordinal forms.

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