How to Use the C# Compiler

To use the C# Compiler, follow these steps:

  1. In the code editor, write your C# code.
  2. Click the "RUN" button to compile and run your code.
  3. The output will be displayed in the console below the code editor.

Taking Inputs

In C#, you can take inputs from the user in various ways. Here are some examples:

String Input

Console.Write("Enter a string: ");
string input = Console.ReadLine();
Console.WriteLine("You entered: " + input);

Number Input

Console.Write("Enter a number: ");
int num = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("You entered: " + num);

Importing Libraries

C# has a rich set of built-in libraries that can be used in your programs. Here are some examples:

Using the Math Library

double result = Math.Sqrt(25);
Console.WriteLine("Square root of 25 is " + result);

Using the List Class

List<int> arr = new List<int> {1, 2, 3, 4, 5};
foreach (int i in arr)
    Console.Write(i + " ");

Syntax 101

C# is a modern, object-oriented programming language that is simple, powerful, type-safe, and flexible. Here's a primer on the major syntax basics of C#:


Variables in C# must be defined with the type of data that they will store.

string name = "John Doe"; // Variable assignment
int age = 25; // Variable assignment

Control Structures

C# includes control structures such as if, else, for, while, and switch.

// If-Else
if (age > 18)

// For loop
for (int i = 0; i < 5; i++)


Functions in C# are defined within a class and use the void keyword for no return value.

public void Greet(string name)
    Console.WriteLine("Hello, " + name);

Greet("John Doe"); // Calls the function with "John Doe" as the argument

C# Online Test

A C# online test is an effective way to assess an individual's C# programming skills, especially in the context of Windows development and game development with Unity. These tests typically include a mix of theoretical questions and practical coding challenges. By attempting these tests, candidates can demonstrate their understanding of C# concepts, their problem-solving abilities, and their proficiency in writing efficient code. C# online tests are commonly used in technical interviews, coding bootcamps, and online learning platforms to gauge a learner's understanding and proficiency in C#.