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C# Basics

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Character

The keyword char represents a single character. A character value is always enclosed in single quotes (').

main.cs

main.cs

copy
using System;

namespace ConsoleApp
{
internal class Program
{
static void Main(string[] args)
{
char letter1 = 'a';
char letter2 = 'b';

Console.WriteLine(letter1); // Output: a
Console.WriteLine(letter2); // Output: b
}
}
}

              
12345678910111213141516

            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
          char letter1 = 'a';
		  char letter2 = 'b';

		  Console.WriteLine(letter1); // Output: a
		  Console.WriteLine(letter2); // Output: b
        }
    }
}

Every character has a corresponding number in the ASCII table, which is a system used by computers to represent text. For example, a is 97 and b is 98. You can see the full table here. Arithmetic operations on characters use these numbers. For example:

main.cs

main.cs

copy
using System;

namespace ConsoleApp
{
internal class Program
{
static void Main(string[] args)
{
char var1 = 'a';
char var2 = 'b';

Console.WriteLine(var1 + var2); // Output: 195
}
}
}

              
123456789101112131415

            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
          char var1 = 'a';
		  char var2 = 'b';

		  Console.WriteLine(var1 + var2); // Output: 195
        }
    }
}

The above code outputs 195 because the sum of the ASCII values of a and b is 195.

The digits from 0 to 9 can also be represented as characters by enclosing them in single quotes:

char val = '7';

However, digits represented as characters are NOT the same as integers.

Note

Summing letters using ASCII values can be useful in creating simple hash functions. These functions can be used for data integrity checks or distributing data across storage systems. By summing the ASCII values of characters in a string, you can generate a unique numerical representation of that string.

question mark

Which one of these is a char value?

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