 using System;
using System.Linq;
using System.Linq.Expressions;

public static class Program
{
    public static void Main()
    {
        var govno = new Govnoclass();

        govno.Update(1);
        govno.Update(4);
        govno.Update(2);
        govno.Update(5);
        govno.Update(3);
    }
}

public class Govnoclass
{
    private static readonly Action<Govnoclass, int> _govnoDispatcher
      = GovnoHelper.CreateByIndexDispatcher<Govnoclass>("Govno_");

    public void Govno_1() { Console.WriteLine(nameof(Govno_1)); }
    public void Govno_2() { Console.WriteLine(nameof(Govno_2)); }
    public void Govno_3() { Console.WriteLine(nameof(Govno_3)); }
    public void Govno_4() { Console.WriteLine(nameof(Govno_4)); }
    public void Govno_5() { Console.WriteLine(nameof(Govno_5)); }

    public void Update(int index)
    {
        _govnoDispatcher(this, index);
    }
}

public static class GovnoHelper
{
    public static Action<T, int> CreateByIndexDispatcher<T>(string methodPrefix)
    {
        var prefixLength = methodPrefix.Length;

        var objArg = Expression.Parameter(typeof(T), "obj");
        var indexArg = Expression.Parameter(typeof(int), "index");

        var cases = typeof(T)
            .GetMethods()
            .Where(method => method.Name.StartsWith(methodPrefix))
            .Select(method =>
            {
                var index = int.Parse(method.Name.Substring(prefixLength));
                return Expression.SwitchCase(
                    Expression.Call(objArg, method),
                    Expression.Constant(index));
            })
            .ToArray();

        var invalidOperationConstructor = typeof(ArgumentOutOfRangeException).GetConstructor(new[] { typeof(string) });
        var defaultCase = Expression.Throw(Expression.New(invalidOperationConstructor, Expression.Constant(indexArg.Name)));
        var actionExpr = Expression.Lambda<Action<T, int>>(
            Expression.Switch(indexArg, defaultCase, cases),
            objArg, indexArg);

        return actionExpr.Compile();
    }
}

created 1 year ago

C Sharp Online Compiler

Write, Run & Share C# code online using OneCompiler's C# online compiler for free. It's one of the robust, feature-rich online compilers for C# language, running on the latest version 8.0. Getting started with the OneCompiler's C# compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C# and start coding.

Read inputs from stdin

OneCompiler's C# online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

using System;
 
namespace Sample
{
  class Test
    {
      public static void Main(string[] args)
       {
         string name;
         name = Console.ReadLine();
         Console.WriteLine("Hello {0} ", name);
	}
     }
}

About C Sharp

C# is a general purpose object-oriented programming language by Microsoft. Though initially it was developed as part of .net but later it was approved by ECMA and ISO standards.

You can use C# to create variety of applications, like web, windows, mobile, console applications and much more using Visual studio.

Syntax help

Data types

Data Type	Description	Range	size
int	To store integers	-2,147,483,648 to 2,147,483,647	4 bytes
double	to store large floating point numbers with decimals	can store 15 decimal digits	8 bytes
float	to store floating point numbers with decimals	can store upto 7 decimal digits	4 bytes
char	to store single characters	-	2 bytes
string	to stores text	-	2 bytes per character
bool	to stores either true or false	-	1 bit

Variables

Syntax

datatype variable-name = value;

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition or set of few conditions IF-ELSE is used.

if(conditional-expression) {
   // code
} 
else {
   // code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement) {
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

data-type[] array-name;

Methods

Method is a set of statements which gets executed only when they are called. Call the method name in the main function to execute the method.

Syntax

static void method-name() 
{
  // code to be executed
}