Chapter One Lesson Two

Chapter OneLesson Three

DATA TYPES

What is Data type?

Data types are sets (ranges) of values that have similarcharacteristics.

For instance byte type specifies the set of integers in therange of [0 … 255].

Types

Basic data types in C# are distributed into the followingtypes:

- Integer types (Whole Number without Negative) –short(int16), int(int32) long(int64);

- Real floating-point types(Decimal number with orwithout negative and ) – float, double;

- Real type with decimal precision – decimal;

- Boolean type – bool (True or False);

- Character type – char;

- String – string;

- Object type – object.

Integer types- examples

{

Int16 centuries = 20;

Int16 years = 2000;

Int32 days = 730480;

Int32 hours = 17531520;

Int32 minutes =1051891200;

Int64 seconds = 63113472000;

Int64 milliseconds = 3786808320000;

Console.WriteLine(centuries + " centuries are " + years +" years, or " + days + " days, or " + hours + "hours or " + minutes + " minutes or " + seconds +" seconds or " + milliseconds + " millisoconds ");

Console.ReadLine();

}

Double Types

Double and Decimal types are used for numbers withdecimal numbers and negative number

Double: It is also called double precision real number and isa 64-bit type with a default value of 0.0d and 0.0D (thesuffix 'd' is not mandatory because by default all realnumbers in C# are of type double).

This type has precision of 15 to 16 decimal digits. The range of values, whichcan be recorded in double (rounded with precision of 15-16 significantdecimal digits),

Decimal type

The type of data for real numbers with decimal precision inC# is the 128-bit type decimal. It has a precision from28 to 29 decimal places.

Example – Double Vs Decimal

static void Main(string[] args)

{ int a = 1;

int b = 2;

decimal PI = 3.142857142857143m;

double pi = 3.142857142857143;

Console.WriteLine(PI);

Console.WriteLine(pi);

Console.ReadLine();

}

Next Lesson

Boolean Type