| Variable | An identifier for a value our program needs to keep track of. Can be any data type. |
| Declaring Variables | The act of typing out the variable data type and name. |
| Variable Type | There are many different data types of variables in C# including: strings, characters, integers, decimals, booleans, etc. |
| string | General written text ie. a Name, or Sentence. Strings are enclosed by " For example: string myName = "Bob"; |
| character | General written text character (Unicode Character) ie. a letter: a. Characters are enclosed by ' For example: char myInitial = 'B'; |
| integer | Most commonly written whole numbers ie. 1, 2, 3, 27 with a range from -2,147,483,648 to 2,147,483,647. For example: int myNumber = 365; |
| long | A whole number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. For example: long myLongNumber = 9223372036854775806; |
| decimal | A number that is not a whole number ie. 1.9. For example: dec myNumber = 1.9; |
| float | A 32 bit floating point value that has an approximate precision of 6-9 digits or a number that is also not a whole number ie. 3.141592. For example: float myNumber = 3.141592; |
| double | A 64 bit floating point value that has an approximate precision of ~15-17 digits or a number that is also not a whole number ie. 3.14159265359. For example: double myNumber = 3.14159265359; |
| boolean | Used in logical operations and is a True or False value For example: bool isMyComputerOn = True; |
| byte | Used when representing a raw chunk of data (values from 0 to 255). For example: byte myByte = 255; |
| var | General variable declaration and C# assumes the variable type dependent on what you set the variable to. For example: a string var myName = "Bob"; or an integer var myNumber = 1; or a decimal var myNumber = 1.1; |
| index | Starts at 0 and denotes the exact position of the item, and can be accessed using [] on a string. For example: sentence[0] will retrieve the first character. |
| .Length | This is a way to retrieve the length property of a variable. Most generally used with strings. For example: sentence.Length; |
| DateTime | DateTime is a specialized class to store the date and time. A DateTime is a Year, Month, Day, Hour, Minute, Second, and Millisecond. For example: var rightNow = DateTime.Now; |
