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An integer is 16-bit in TP or FPC modes, or 32-bit in ObjFPC or Delphi modes.įor 64-bit calculation, FPC does support 64-bit Int64 though, which may be defined as a value of -2 63 through 2 63-1, or -9 223 372 036 854 775 808. Typical sizes of integer generally areĬurrently, the integer type is only dependent on $mode, not on the CPU type.
#Free pascal longint 32 bit
The size of an integer is dependent upon the bit size of the target machine to which the compiler is to generate code ( 32 bit or 64 bit), the type of compiler (16-bit, 32-bit or 64-bit), and upon compiler switches in some cases. It is used to define a whole number, as opposed to a real data type (which is used to define a floating point number which may contain a decimal point and possibly an exponent). Integer is a standard type of the Pascal Programming language. Syntax for declaring a subrange type is as follows − You can also define a subrange type using the type declaration. We will look at variable declaration in detail in the next section. For example, if the age of voters should lie between 18 to 100 years, a variable named age could be declared as − Subrange types allow a variable to assume values that lie within a certain range. The domain of enumerated type identifiers cannot consist of numeric or character constants. For example, in the enumerated type SUMMER, April comes before May, May comes before June, and so on. The order in which the items are listed in the domain of an enumerated type defines the order of the items.
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TRANSPORT = (Bus, Train, Airplane, Ship) SUMMER = (April, May, June, July, September) ĬOLORS = (Red, Green, Blue, Yellow, Magenta, Cyan, Black, White) )įollowing are some examples of enumerated type declarations − Enumerated data types can be declared as follows −Įnum-identifier = (item1, item2, item3. Only assignment operators and relational operators are permitted on enumerated data type. They allow values to be specified in a list. Enumerated typesĮnumerated data types are user-defined data types. Syntax of constant type declaration is follows −įollowing are some examples of constant declarations −Īll constant declarations must be given before the variable declaration. Constants can be declared in the declaration part of the program by specifying the const declaration. Pascal allows numerical, logical, string and character constants. Use of constants makes a program more readable and helps to keep special quantities at one place in the beginning of the program. Type-identifier-1, type-identfier-2 = type-specifier įor example, the following declaration defines the variables days and age as integer type, yes and true as Boolean type, name and city as string type, fees and expenses as real type.įollowing table gives you details about standard integer types with its storage sizes and value ranges used in Object Pascal − Type
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The type declaration is used to declare the data type of an identifier. Pascal data types can be summarized as below in the following diagram − Type Declarations We will discuss the pointer data types later. Structured data types are made of the scalar types for example, arrays, records, files and sets. Examples of scalar data types are integer, real, Boolean, character, subrange and enumerated. Data types can be categorized as scalar, pointer and structured data types. Integer, real, Boolean and character types are referred as standard data types. Data types of an entity indicates the meaning, constraints, possible values, operations, functions and mode of storage associated with it.