Pascal Variable Type
A variable is nothing but a name given to a storage area that our programs can manipulate. Each variable in Pascal has a specific type, which determines the size and layout of the variable's memory; the range of values that can be stored within that memory; and the set of operations that can be applied to the variable.
The name of a variable can be composed of letters, digits, and the underscore character. It must begin with either a letter or an underscore. Pascal is not case-sensitive, so uppercase and lowercase letters mean same here. Based on the basic types explained in previous chapter, there will be following basic variable types.
Pascal programming language also allows defining various other types of variables, which we will cover in subsequent chapters like Pointer, Array, Records, Sets, and Files, etc. For this chapter, we will study only basic variable types.
Variable Declaration in Pascal
All variables must be declared before we use them in Pascal program. All variable declarations follow behind the var keyword. A declaration specifies a list of variables, followed by a colon (:) and the type.