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C# Full Course for free/3.Variables.md

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+# Variables
+
+## int 
+
+for storing integer
+
+```c#
+int age = 21;
+```
+
+## double
+
+can store a decimal
+
+```C#
+double height = 300.5;
+```
+
+## bool
+
+can store boolean
+only true or false
+
+```C#
+bool alive = true;
+```
+
+## char
+
+for a single carachter
+
+```C#
+char symbole = '@';
+```
+
+## String
+
+don't forget the S in upper
+
+```C#
+String name = "Hello";
+```
+
+## constants
+
+immutable values wich are known at compile time and 
+do not change for th life of the program
+
+just add the const keyword
+
+```C#
+const double pi = 3.14;
+```
+
+## Type casting
+
+Converting a value to a different data type
+Very useful because user input will always be strings
+
+```C#
+double a = 3.14;
+int b= Convert.ToInt32(a);
+
+int c= 123;
+double d= Convert.ToDouble(c);
+
+int e= 321;
+String d= Convert.ToString(e);
+
+String g = "$";
+char h = Convert.ToChar(g);
+
+String i = "true";
+bool j = Convert.ToBoolean(i);
+```
+
+## GetType
+
+Get the type of a variable
+
+```C#
+double a = 3.14;
+Console.WriteLine(a.GetType())
+```