![]() ![]() Modern versions of BASIC (such as VBA) support a wide variety of primitive (or intrinsic) data types, in addition to user-defined ones. Additionally, some allow the use of user-defined data types, similar to Pascal’s “records” or C “structs.” Many dialects also support additional numeric types, such as 16-bit and 32-bit integers (simple and long, respectively), in addition to their floating-point numbers. Declaration of variables in BASIC is done using the DIM keyword. In BASIC variables do not necessarily need to be declared before use, except for arrays of more than 10 elements although relatively modern BASIC versions have the option (considered good programming practice) to force the programmer to declare every variable before use (a directive like OPTION EXPLICIT). These data types can be distinguished using a postfix: string identifiers end with $ (dollar sign, for example the variable NAME $), while numeric identifiers simply do not have a postfix unless it is required to explicitly indicate and force what kind of numeric it is, for example A% is integer, A! is real single precision and A # is real double precision. It supported arrangements of both numbers and strings, in one or two dimensions.Įvery modern dialect of BASIC has at least the numeric and string data types. All numeric variables were floating point. The original Dartmouth BASIC supported only numeric and string data. Since strings are used in everyday applications, this was a considerable advantage over other languages at the time of their introduction. Early dialects already had a set of fundamental functions (LEFT $, MID $, RIGHT $) to extract and replace substrings easily. Beginner’s All-Purpose Symbolic Instruction Code is abbreviated by as BASIC which is known for having very good functions for manipulating character strings. ![]()
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