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This allows for string arrays; DIM A$ (10) creates an array of eleven string variables numbered 0–10. Multidimensional arrays (numbers or strings) Single-precision floating-point variables with an 8-bit exponent and a 31-bit significand and improved math capabilities, including trigonometry and logarithmic functions; Commands for high ...
The choice of a variable name should be mnemonic — that is, designed to indicate to the casual observer the intent of its use. One-character variable names should be avoided except for temporary "throwaway" variables. Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters. int i;
FORTRAN's odd system for setting up the variables I through N as integers and the rest as floating point was removed, and all variables were assumed to be floating point and dimensioned with up to 10 elements. The DIM command was only required if the array held more than ten elements. [47] Array names were restricted to A to Z only.
The default type may be overridden for a specific declaration by using a special suffix character on the variable name (# for Double, ! for Single, & for Long, % for Integer, $ for String, and @ for Currency) or using the key phrase As (type). VB can be setup to require variable declarations via Option Explicit.
The data type of variables can be specified with a character at the end of the variable name: A$ is a string of characters, A% is an integer, etc. Groups of variables can also be set to default types based on the initial letter of their name by use of the DEFINT, DEFSTR, etc., statements.
Variable names in the early versions of BASIC-PLUS could be a single letter or a single letter followed by a single digit. [5] With the inclusion of "Extend mode" in later versions, variable names could be up to 29 characters long, and dot (.) was added as a permitted character. Every variable name still had to begin with a letter.
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In addition to support for vectorized arithmetic and relational operations, these languages also vectorize common mathematical functions such as sine. For example, if x is an array, then y = sin (x) will result in an array y whose elements are sine of the corresponding elements of the array x. Vectorized index operations are also supported.