Difference between revisions of "Data type"
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* [[Char|char]] - Single character | * [[Char|char]] - Single character | ||
* [[Integer|integer]] - a whole number. FPC currently uses 4 bytes for integers | * [[Integer|integer]] - a whole number. FPC currently uses 4 bytes for integers | ||
| − | * [[real]] - a number which may have a decimal point and possibly an exponent | + | * [[Real|real]] - a number which may have a decimal point and possibly an exponent |
* [[cardinal]] - an unsigned whole number,ie it must be positiv | * [[cardinal]] - an unsigned whole number,ie it must be positiv | ||
* [[set]] - a collection of related elements; size depends on number of elements | * [[set]] - a collection of related elements; size depends on number of elements | ||
Revision as of 22:40, 21 July 2015
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A data type is a classification of a variable or constant. There are certain data types that are predefined by any Pascal compiler (because you need them to make everything else). These are:
- byte - an unsigned number in the range 0 to 255
- char - Single character
- integer - a whole number. FPC currently uses 4 bytes for integers
- real - a number which may have a decimal point and possibly an exponent
- cardinal - an unsigned whole number,ie it must be positiv
- set - a collection of related elements; size depends on number of elements
- pointer - a reference to a location in memory, generally used for dynamic variables
- record - a combination of the above data types collected together
- class
- object - a hybrid entity that may contain data and procedures to manipulate that data
Other data types are generally made with some combination of the above. FPC adds additional data types.
