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Geekpedia » C# Tutorials » C# data types

C# data types

Quickly covers C#'s data types by giving a few examples. Good for transition between C or C++ to C#.

On Saturday, April 3rd 2004 at 05:50 PM

By Andrew Pociu (View Profile)

(Rated 3 with 17 votes)

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C# Data Types

The following example will show you the information you need about C#'s data types:




// DataTypes.cs

using System;

    class DataTypes

    {

        static void Main()

        {

            Console.WriteLine("The minimum and maximum sizes of C#'s datatypes:\n");

            Console.WriteLine("sbyte\nMin: {0}\nMax: {1}\n", sbyte.MinValue, sbyte.MaxValue);

            Console.WriteLine("byte\nMin: {0}\nMax: {1}\n", byte.MinValue, byte.MaxValue);

            Console.WriteLine("short\nMin: {0}\nMax: {1}\n", short.MinValue, short.MaxValue);

            Console.WriteLine("ushort\nMin: {0}\nMax: {1}\n", ushort.MinValue, ushort.MaxValue);

            Console.WriteLine("int\nMin: {0}\nMax: {1}\n", int.MinValue, int.MaxValue);

            Console.WriteLine("uint\nMin: {0}\nMax: {1}\n", uint.MinValue, uint.MaxValue);

            Console.WriteLine("long\nMin: {0}\nMax: {1}\n", long.MinValue, long.MaxValue);

            Console.WriteLine("ulong\nMin: {0}\nMax: {1}\n", ulong.MinValue, ulong.MaxValue);

            Console.WriteLine("float\nMin: {0}\nMax: {1}\n", float.MinValue, float.MaxValue);

            Console.WriteLine("double\nMin: {0}\nMax: {1}\n", double.MinValue, double.MaxValue);

            Console.WriteLine("decimal\nMin: {0}\nMax: {1}\n", decimal.MinValue, decimal.MaxValue);

            Console.ReadLine(); // Keep the console opened until you press Enter

        }

    }

The output of the program is:




The minimum and maximum sizes of C#'s datatypes:



sbyte

Min: -128

Max: 127



byte

Min: 0

Max: 255



short

Min: -32768

Max: 32767



ushort

Min: 0

Max: 65535



int

Min: -2147483648

Max: 2147483647



uint

Min: 0

Max: 4294967295



long

Min: -9223372036854775808

Max: 9223372036854775807



ulong

Min: 0

Max: 18446744073709551615



float

Min: -3.402823E+38

Max: 3.402823E+38



double

Min: -1.79769313486232E+308

Max: 1.79769313486232E+308



decimal

Min: -79228162514264337593543950335

Max: 79228162514264337593543950335

sbyte is the signed version of byte (8 bits);
short is the signed version of ushort (16 bits);
int is the signed version of uint (32 bits);
long is the signed version of ulong (64 bits);

The 'char' type stores a single character;
The 'string' data type stores multiple characters;

Getting the length of a string

Suppose you have the 'content' variable that is a 'string' type of variable:




string content = "The actual string";

You can find the length of this string using:




content.Length

For example:




using System;

    class StringLength

    {

        static void Main()

        {

            string Content = "The actual string";

            Console.WriteLine("{0}\n", Content);

            Console.WriteLine("The length of the above string is {0} characters", Content.Length);

            Console.ReadLine(); // Keep the console opened until you press Enter

        }

    }

The 'float' data type is 32 bits long. It has an 8 bits long exponent and 24 bits long mantissa;
The 'double' data type is 64 bits long. It has an 11 bits long exponent and 53 bits long mantissa;

C# arrays

You can initialize an array using:




int[] objects;

If you want to allocate a space in memory for the elements of the array use:




int[] objects = new int[5];

or separate:




int[] objects;

objects = new int[5];

This is a complete example of initializing an array and accessing it using a loop:




using System;



    class Arrays

    {

        static void Main()

        {

            char[] website = new char[9] {'G', 'e', 'e', 'k', 'p', 'e', 'd', 'i', 'a'};

            int i = 0;

            for (i = 0; i < website.Length; i++)

            {

            Console.Write("{0}", website[i]);

            }

        Console.ReadLine();

        }

    }

(The above example could be simplified by using a 'foreach' loop like in VB but I wanted to stick to the topic).

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Current Comments

by wrong on Monday, November 21st 2005 at 02:39 PM

float is actually 8 bits exponent, 23 bits mantissa, 1 sign bit

by dileep S on Wednesday, September 13th 2006 at 01:09 AM

There is any maximum limit for string . if so what is that ?

by praveenkumarpathak on Friday, December 14th 2007 at 06:50 AM

please program my hand over me.

praveen kumar pathak

by Corey Ogburn on Monday, May 19th 2008 at 04:39 PM

This subject has been thrown around a little at the office here recently. We agreed that all arrays have one limit, the index has to be an integer. Therefore, the array can't be bigger then an integer value can hold ( 2147483647). So roughly 2 GBs. We agree even more so that you'll run out of RAM long before you'll run out of array length. ha ha

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