Fix output of complex number formatting (#46235)

* fix output of complex number formatting

* break long lines

Author: gewarren

docs/core/compatibility/core-libraries/8.0/complex-format.md

@@ -36,3 +36,7 @@ If you need the previous format, you can use a custom string formatting mechanis
 ## Affected APIs
 
 - <xref:System.Numerics.Complex.ToString%2A?displayProperty=fullName>
+
+## See also
+
+- [Format a complex number](../../../../fundamentals/runtime-libraries/system-numerics-complex.md#format-a-complex-number)

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/Program.cs

@@ -0,0 +1 @@
+CustomFormatEx.Run();

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/Project.csproj

@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>Library</OutputType>
-    <TargetFrameworks>net8</TargetFrameworks>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net9</TargetFrameworks>
   </PropertyGroup>
 
  </Project>

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/create1.cs

@@ -4,7 +4,7 @@
 
 public class CreateEx
 {
-    public static void Main()
+    public static void Run()
     {
         // Create a complex number by calling its class constructor.
         Complex c1 = new Complex(12, 6);

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/customfmt1.cs

@@ -15,17 +15,16 @@ public object GetFormat(Type formatType)
     public string Format(string format, object arg,
                          IFormatProvider provider)
     {
-        if (arg is Complex)
+        if (arg is Complex c1)
         {
-            Complex c1 = (Complex)arg;
             // Check if the format string has a precision specifier.
             int precision;
-            string fmtString = String.Empty;
+            string fmtString = string.Empty;
             if (format.Length > 1)
             {
                 try
                 {
-                    precision = Int32.Parse(format.Substring(1));
+                    precision = int.Parse(format.Substring(1));
                 }
                 catch (FormatException)
                 {
@@ -42,12 +41,12 @@ public string Format(string format, object arg,
         }
         else
         {
-            if (arg is IFormattable)
-                return ((IFormattable)arg).ToString(format, provider);
+            if (arg is IFormattable formattable)
+                return formattable.ToString(format, provider);
             else if (arg != null)
                 return arg.ToString();
             else
-                return String.Empty;
+                return string.Empty;
         }
     }
 }
@@ -56,22 +55,21 @@ public string Format(string format, object arg,
 // <Snippet4>
 public class CustomFormatEx
 {
-    public static void Main()
+    public static void Run()
     {
-        Complex c1 = new Complex(12.1, 15.4);
-        Console.WriteLine("Formatting with ToString():       " +
-                          c1.ToString());
-        Console.WriteLine("Formatting with ToString(format): " +
-                          c1.ToString("N2"));
-        Console.WriteLine("Custom formatting with I0:        " +
-                          String.Format(new ComplexFormatter(), "{0:I0}", c1));
-        Console.WriteLine("Custom formatting with J3:        " +
-                          String.Format(new ComplexFormatter(), "{0:J3}", c1));
+        Complex c1 = new(12.1, 15.4);
+        Console.WriteLine($"Formatting with ToString:         {c1}");
+        Console.WriteLine($"Formatting with ToString(format): {c1:N2}");
+        Console.WriteLine($"Custom formatting with I0:\t" +
+            $"  {string.Format(new ComplexFormatter(), "{0:I0}", c1)}");
+        Console.WriteLine($"Custom formatting with J3:\t" +
+            $"  {string.Format(new ComplexFormatter(), "{0:J3}", c1)}");
     }
 }
+
 // The example displays the following output:
-//    Formatting with ToString():       (12.1, 15.4)
-//    Formatting with ToString(format): (12.10, 15.40)
+//    Formatting with ToString():       <12.1; 15.4>
+//    Formatting with ToString(format): <12.10; 15.40>
 //    Custom formatting with I0:        12 + 15i
 //    Custom formatting with J3:        12.100 + 15.400j
 // </Snippet4>

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/nan1.cs

@@ -4,7 +4,7 @@
 
 public class NaNEx
 {
-    public static void Main()
+    public static void Run()
     {
         Complex c1 = new Complex(Double.MaxValue / 2, Double.MaxValue / 2);
 

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/precision1.cs

@@ -1,9 +1,9 @@
-using System;
+using System;
 using System.Numerics;
 
 public class PrecisionEx
 {
-    public static void Main()
+    public static void Run()
     {
         // <Snippet5>
         Complex value = new Complex(Double.MinValue / 2, Double.MinValue / 2);

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/vb/Program.vb

@@ -0,0 +1,5 @@
+Public Class Program
+    Public Shared Sub Main()
+        Example2.Run()
+    End Sub
+End Class

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/vb/Project.vbproj

@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>Library</OutputType>
-    <TargetFrameworks>net8</TargetFrameworks>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net9</TargetFrameworks>
   </PropertyGroup>
 
  </Project>

docs/fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/vb/create1.vb

@@ -5,7 +5,7 @@ Option Strict On
 Imports System.Numerics
 
 Module Example
-   Public Sub Main()
+   Public Sub Run()
       ' Create a complex number by calling its class constructor.
       Dim c1 As New Complex(12, 6)
       Console.WriteLine(c1)