C#: Built in Types

C# support almost all kind of data types to work with. All data types are represented as classes in System namespace. Data types can be categorized into following types.

a.   Boolean : bool

b.   Integer: byte, sbyte, int, uint, short, ushort, long, ulong

c.   Float: double, float, decimal

d.   Character : char

e.   String

Following table summarizes all the data types

Short Name	Class	Min value	Max value
byte	Byte	0	255
sbyte	SByte	-128	127
int	Int32	-2,147,483,648	2,147,483,647
uint	UInt32	0	4294967295
short	Int16	-32,768	32767
ushort	UInt16	0	65535
long	Int64	- 9223372036854775808	9223372036854775807
ulong	UInt64	0	18446744073709551615
float	Single	-3.402823e38	3.402823e38
double	Double	-1.79769313486232e308	1.79769313486232e308
decimal	Decimal	±1.0 × 10e−28	±7.9 × 10e28
char	Char		Represent Unicode character. It take 16 bits.
string	String		Sequence of characters

Note

a. Suffix Float variables by f.

         Ex:  float floatVar = 18.18f;

b. Suffix Decimal variables by m.

         Ex: decimal decimalVar = 20.20m;

Program.cs

using System;

class Program
{
    static void Main(string[] args)
    {
        byte byteVar = 10;
        sbyte sbyteVar = 11;
        int intVar = 12;
        uint uintVar = 13;
        short shortVar = 14;
        ushort ushortVar = 15;
        long longVar = 16;
        ulong ulongVar = 17;
        float floatVar = 18.18f;
        double doubleVar = 19.19;
        decimal decimalVar = 20.20m;
        char charVar = 'S';
        string stringVar = "Hello World";

        Console.WriteLine("byteVar = {0}", byteVar);
        Console.WriteLine("sbyteVar = {0}", sbyteVar);
        Console.WriteLine("intVar = {0}", intVar);
        Console.WriteLine("uintVar = {0}", uintVar);
        Console.WriteLine("shortVar = {0}", shortVar);
        Console.WriteLine("ushortVar = {0}", ushortVar);
        Console.WriteLine("longVar = {0}", longVar);
        Console.WriteLine("ulongVar = {0}", ulongVar);
        Console.WriteLine("floatVar = {0}", floatVar);
        Console.WriteLine("doubleVar = {0}", doubleVar);
        Console.WriteLine("decimalVar = {0}", decimalVar);
        Console.WriteLine("charVar = {0}", charVar);
        Console.WriteLine("stringVar = {0}", stringVar);
    }
}

Output

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