Common Type System in .Net
Identifiers: Identifiers are used to describe allocated memory types such as integer, longs, classes, and other types defined by C# or by you, as the developer. The rules for identifiers are given below.
1) Identifiers can start with any Unicode letter or an underscore.
2) Identifiers are case-sensitive.
3) Identifiers must be unique within a particular scope: namespace, class, method, code block
In C# there is a defined set of naming conventions and Recommendations. The following are the two recommended naming conventions for C#:
1)Pascal casing: Pascal casting is the default convention for all names with the exception of protected instance fields and parameters.
2)Camel casing: This convention is used only for protected instance fields and parameters.
Open .net software following steps are needed
Start->programs->Microsoft visual studio 2010->Microsoft Visual studio 2010->file menu->new->
project->select visual c# from installed templates->select console application
Code Example: Identifiers and naming Conventions
// Adds System namespace
using System;
//Defines a new namespace
namespace Chapter1CommonTypeSystem
{
//Defines a new class
class MyMainClass
{
//Defines a static method that serves as an entry point
//for the application
static void Main(string[] args)
{
//Declares an instance of variables
int MyInt = 10;
long MyLong = MyInt;
short MyShort = (short)MyInt;
My2ndFunction(MyInt);
}
//defines a public static method
public static int My2ndFunction(int myInt)
{
return myInt;
}
}
}
Working with pre-defined datatypes:
Datatypes are also called as primitive data types. This datatypes are divided into 4 groups.
1)Integral related datatypes: They are 8 types
Byte, SByte, short, ushort, int, uint, long, ulong.
2)Floating related datatypes:
Float, double, decimal.
3)Character related datatypes:
Char, string.
4)other types of datatypes:
Bool, It’s Description is true\false.
Code Example: Using Variables
Open console Application project
using System;
using System.collections;
using System.Linq;
using System.Text;
namespace CommonTypeSystem
{
class program
{
static void Main(string[] args)
{
int i = 10; //value type (or) local variable
Console.WriteLine(i);
float x = 4.1f;
Console.WriteLine(x);
Byte b1 = 10, b2 = 20;
int c = b1 + b2;
Console.WriteLine("sum is:" + c);
Console.ReadKey();
}
}
}
Execute the project:(goto debug menu->start debugging) (or) F5
Observations on above projects:
1)int i=10 local variables (value types) must be initillized before using that variable.
2)float x=4.1; gives an error.
3) + operator is used to add the numbers and concatenate the strings
4)Console.Readkey(): holds the output screen until pressing any character in the keyboard, Which is same as getch() of c language.
