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Fix Complex number custom formatting for negative imaginary parts #46897

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Fix Complex number custom formatting for negative imaginary parts #46897

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1b0c531
Initial plan for issue
Copilot Jun 19, 2025
6110224
Initial setup: Identify and reproduce the negative imaginary part for…
Copilot Jun 19, 2025
25b2ffe
Fix Complex number formatting for negative imaginary parts
Copilot Jun 19, 2025
67292f6
Address code review feedback: Add periods to code comments and fix ta…
Copilot Jun 19, 2025
cfe6803
Update target framework to net9.0 in project files
Copilot Jun 19, 2025
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2 changes: 1 addition & 1 deletion ...mentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/Project.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFrameworks>net9</TargetFrameworks>
<TargetFramework>net9.0</TargetFramework>
</PropertyGroup>

</Project>
14 changes: 12 additions & 2 deletions ...amentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/csharp/customfmt1.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -33,9 +33,19 @@ public string Format(string format, object arg,
fmtString = "N" + precision.ToString();
}
if (format.Substring(0, 1).Equals("I", StringComparison.OrdinalIgnoreCase))
return c1.Real.ToString(fmtString) + " + " + c1.Imaginary.ToString(fmtString) + "i";
{
// Determine the sign to display.
char sign = c1.Imaginary < 0 ? '-' : '+';
// Display the determined sign and the absolute value of the imaginary part.
return c1.Real.ToString(fmtString) + " " + sign + " " + Math.Abs(c1.Imaginary).ToString(fmtString) + "i";
}
else if (format.Substring(0, 1).Equals("J", StringComparison.OrdinalIgnoreCase))
return c1.Real.ToString(fmtString) + " + " + c1.Imaginary.ToString(fmtString) + "j";
{
// Determine the sign to display.
char sign = c1.Imaginary < 0 ? '-' : '+';
// Display the determined sign and the absolute value of the imaginary part.
return c1.Real.ToString(fmtString) + " " + sign + " " + Math.Abs(c1.Imaginary).ToString(fmtString) + "j";
}
else
return c1.ToString(format, provider);
}
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2 changes: 1 addition & 1 deletion ...undamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/vb/Project.vbproj
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFrameworks>net9</TargetFrameworks>
<TargetFramework>net9.0</TargetFramework>
</PropertyGroup>

</Project>
7 changes: 5 additions & 2 deletions ...fundamentals/runtime-libraries/snippets/System.Numerics/Complex/Overview/vb/customfmt1.vb
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Original file line number Diff line number Diff line change
Expand Up @@ -32,10 +32,13 @@ Public Class ComplexFormatter
End Try
fmtString = "N" + precision.ToString()
End If
' Determine the sign to display.
Dim sign As Char = If(c1.Imaginary < 0.0, "-"c, "+"c)
' Display the determined sign and the absolute value of the imaginary part.
If fmt.Substring(0, 1).Equals("I", StringComparison.OrdinalIgnoreCase) Then
Return c1.Real.ToString(fmtString) + " + " + c1.Imaginary.ToString(fmtString) + "i"
Return c1.Real.ToString(fmtString) + " " + sign + " " + Math.Abs(c1.Imaginary).ToString(fmtString) + "i"
ElseIf fmt.Substring(0, 1).Equals("J", StringComparison.OrdinalIgnoreCase) Then
Return c1.Real.ToString(fmtString) + " + " + c1.Imaginary.ToString(fmtString) + "j"
Return c1.Real.ToString(fmtString) + " " + sign + " " + Math.Abs(c1.Imaginary).ToString(fmtString) + "j"
Else
Return c1.ToString(fmt, provider)
End If
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