feat: Add C# Math.Truncate() entry

content/c-sharp/concepts/math-functions/terms/truncate/truncate.md

@@ -0,0 +1,115 @@
+---
+Title: '.Truncate()'
+Description: 'Returns the integer part of a specified number by removing any fractional digits.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Arithmetic'
+  - 'Functions'
+  - 'Methods'
+  - 'Numbers'
+CatalogContent:
+  - 'learn-c-sharp'
+  - 'paths/computer-science'
+---
+
+The **`Math.Truncate()`** method in C# returns the integer part of a specified number by removing any fractional digits. It works with both `decimal` and `double` types.
+
+## Syntax
+
+```pseudo
+Math.Truncate(double d)
+```
+
+Or, alternatively:
+
+```pseudo
+Math.Truncate(decimal d)
+```
+
+**Parameters:**
+
+- `d` (`double` | `decimal`): The number whose fractional part is to be discarded.
+
+**Return value:**
+
+- Returns a `double` if a `double` is passed and a `decimal` if a `decimal` is passed.
+- Special values like `NaN`, `PositiveInfinity`, and `NegativeInfinity` are returned as-is.
+
+> **Note:** `Math.Truncate()` always rounds towards zero. This means `Math.Truncate(2.8)` is 2, and `Math.Truncate(-2.8)` is -2. This is different from `Math.Floor()`, which always rounds down (e.g., `Math.Floor(-2.8)` would be -3).
+
+## Example 1: Using `double`
+
+In this example, a double value is truncated to its integer part:
+
+```cs
+using System;
+
+public class Example {
+  public static void Main() {
+    double positiveValue = 12.9;
+    double negativeValue = -4.7;
+
+    Console.WriteLine("Truncating " + positiveValue + " gives: " + Math.Truncate(positiveValue));
+    Console.WriteLine("Truncating " + negativeValue + " gives: " + Math.Truncate(negativeValue));
+  }
+}
+```
+
+This example results in the following output:
+
+```shell
+Truncating 12.9 gives: 12
+Truncating -4.7 gives: -4
+```
+
+## Example 2: Using `decimal`
+
+In this example, a `decimal` value is truncated without using the `m` suffix by explicitly casting a `double` to `decimal`:
+
+```cs
+using System;
+
+public class Example {
+  public static void Main() {
+    decimal decValue = (decimal)45.678;
+    decimal negDecValue = (decimal)-23.456;
+
+    Console.WriteLine("Truncating decimal " + decValue + " gives: " + Math.Truncate(decValue));
+    Console.WriteLine("Truncating decimal " + negDecValue + " gives: " + Math.Truncate(negDecValue));
+  }
+}
+```
+
+The output of this code is:
+
+```shell
+Truncating decimal 45.678 gives: 45
+Truncating decimal -23.456 gives: -23
+```
+
+## Codebyte Example
+
+In this example, both `double` and `decimal` values are truncated in a small array of numbers:
+
+```codebyte/csharp
+using System;
+
+public class Example {
+  public static void Main() {
+    double[] doubles = { 3.1415, -7.89, 0.99 };
+    decimal[] decimals = { (decimal)12.345, (decimal)-6.78 };
+
+    Console.WriteLine("Double values truncated:");
+    foreach (double d in doubles) {
+      Console.WriteLine(Math.Truncate(d));
+    }
+
+    Console.WriteLine("\nDecimal values truncated:");
+    foreach (decimal d in decimals) {
+      Console.WriteLine(Math.Truncate(d));
+    }
+  }
+}
+```