using System;

namespace HelloWorld
{
	public class Program
	{
		public static void Main(string[] args)
		{
		  // Code interessant ab hier
		  
		  int myInputNumber = 127;
		 
		  
		  if(myInputNumber > 0) // es wird nur ein Pfad aktiviert
		  {
		    // ok
		    Console.WriteLine("Input number ok!");
		    Console.WriteLine("");
		    
		    // Bestimmung ob Primzahl
		    // ergebnis = zahl1 % zahl2
		    // ergebnis = 32 % 3 --> ergebnis = 2
		    // 32 % 1 --> keinen Sinn, weil immer 0
		    // 32 % 2 --> ist keine Primzahl, weil durch 2 restlos teilbar
		    // Plan: Division von myInputNumber durch jede Zahl [1...myInputNumber-1]
		    // rest = myInputNumber % 3
		    // rest = myInputNumber % 3
		    // rest = myInputNumber % 4
		    // ...
		    // rest = myInputNumber % 126
		    
		    for(int i = 2; i < myInputNumber; i++) // bei 2 wird gestart, solange bis i kleiner ist als myInputNumber, am Ende wird i immer um 1 erhöht
		    {
		      int rest = myInputNumber % i;
		      if(rest == 0)
		      {
		        Console.WriteLine("Keine Primzahl!");
		      }
		      // i = i + 1
		    }
		  }
		  else
		  {
		    // Error
		    Console.WriteLine("Invalid input!");
		  }
		  
			Console.WriteLine(myInputNumber); //wird ausgegeben
			
			
			// bis hier
		}
	}
}

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 TypeDescriptionRangesize
intTo store integers-2,147,483,648 to 2,147,483,6474 bytes
doubleto store large floating point numbers with decimalscan store 15 decimal digits8 bytes
floatto store floating point numbers with decimalscan store upto 7 decimal digits4 bytes
charto store single characters-2 bytes
stringto stores text-2 bytes per character
boolto 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
}