static in C++ vs Static class in C#

There is no static class in c++ like in C# , instead we can declare static members and fuctions inside a class in c++

C++ Source :

#include<iostream>
#include<conio.h>
#include<string>

using namespace std;

class TemperatureConverter
{
public :
static double CelsiusToFahrenheit(std::string temperatureCelsius)
{
// Convert argument to double for calculations.
std::string::size_type sz;
double celsius = std::stod(temperatureCelsius, &sz);

// Convert Celsius to Fahrenheit.
double fahrenheit = (celsius * 9 / 5) + 32;

return fahrenheit;
}

static double FahrenheitToCelsius(std::string temperatureFahrenheit)
{
// Convert argument to double for calculations.
std::string::size_type sz;
double fahrenheit = std::stod(temperatureFahrenheit, &sz);

// Convert Fahrenheit to Celsius.
double celsius = (fahrenheit - 32) * 5 / 9;

return celsius;
}
};

void main()
{
cout<<"Please select the convertor direction\n";
cout << "1. From Celsius to Fahrenheit.\n";
cout << "2. From Fahrenheit to Celsius.\n";
cout << ":";

string selection;
int selectionType;
cin >> selection;
double F, C = 0;

if (selection.compare("1") == 0)
{
selectionType = 1;
}
else if (selection.compare("2") == 0)
{
selectionType = 2;
}
else
{
selectionType = 3;
}

std::string value;

switch (selectionType)
{

case 1:
cout<<"Please enter the Celsius temperature:";
cin >> value;
F = TemperatureConverter::CelsiusToFahrenheit(value);
printf("Temperature in Fahrenheit:%0.2f",F);
break;

case 2:
cout << "Please enter the Fahrenheit temperature:";
cin >> value;
C = TemperatureConverter::FahrenheitToCelsius(value);
printf("Temperature in Celsius:%0.2f", C);
break;

default:
cout << "Please select a convertor.";
break;
}

// Keep the console window open in debug mode.
cout <<"\nPress any key to exit.";
_getch();
}



C# source :

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

namespace StaticClassSln
{

    public static class TemperatureConverter
    {
        public static double CelsiusToFahrenheit(string temperatureCelsius)
        {
            // Convert argument to double for calculations.
            double celsius = Double.Parse(temperatureCelsius);

            // Convert Celsius to Fahrenheit.
            double fahrenheit = (celsius * 9 / 5) + 32;

            return fahrenheit;
        }

        public static double FahrenheitToCelsius(string temperatureFahrenheit)
        {
            // Convert argument to double for calculations.
            double fahrenheit = Double.Parse(temperatureFahrenheit);

            // Convert Fahrenheit to Celsius.
            double celsius = (fahrenheit - 32) * 5 / 9;

            return celsius;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please select the convertor direction");
            Console.WriteLine("1. From Celsius to Fahrenheit.");
            Console.WriteLine("2. From Fahrenheit to Celsius.");
            Console.Write(":");

            string selection = Console.ReadLine();
            double F, C = 0;

            switch (selection)
            {
                case "1":
                    Console.Write("Please enter the Celsius temperature: ");
                    F = TemperatureConverter.CelsiusToFahrenheit(Console.ReadLine());
                    Console.WriteLine("Temperature in Fahrenheit: {0:F2}", F);
                    break;

                case "2":
                    Console.Write("Please enter the Fahrenheit temperature: ");
                    C = TemperatureConverter.FahrenheitToCelsius(Console.ReadLine());
                    Console.WriteLine("Temperature in Celsius: {0:F2}", C);
                    break;

                default:
                    Console.WriteLine("Please select a convertor.");
                    break;
            }

            // Keep the console window open in debug mode.
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }
}