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Temperature table

Keep conversion logic separate from invariant table formatting.

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Program.cs

using System;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;

foreach (var celsius in new[] { -10m, 0m, 20m, 100m })
{
    var fahrenheit = Temperature.ToFahrenheit(celsius);
    Console.WriteLine(celsius.ToString("0.0", CultureInfo.InvariantCulture) + " C = " + fahrenheit.ToString("0.0", CultureInfo.InvariantCulture) + " F");
}

Math/Temperature.cs

public static class Temperature
{
    public static decimal ToFahrenheit(decimal celsius) => celsius * 9m / 5m + 32m;
    public static decimal ToCelsius(decimal fahrenheit) => (fahrenheit - 32m) * 5m / 9m;
}

Temperaturetable.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
</Project>