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In Visual Basic, a control array [1] is a group of related controls in a Visual Basic form that share the same event handlers. Control arrays are always single-dimensional arrays, and controls can be added or deleted from control arrays at runtime. One application of control arrays is to hold menu items, as the shared event handler can be used ...
Unlike for many languages which use zero for the lower bound of an array, VB allows the lower bound to be any value – like in Pascal and Fortran. The Option Base statement can be used to set the default lower bound, but some claim that its use leads to confusion when reading code and is best avoided by always explicitly specifying the lower bound
Instead, numeric values of zero are interpreted as false, and any other value is interpreted as true. [9] The newer C99 added a distinct Boolean type _Bool (the more intuitive name bool as well as the macros true and false can be included with stdbool.h), [10] and C++ supports bool as a built-in type and true and false as reserved words. [11]
The equals sign ("=") is used in both assigning values to variables and in comparison. Round brackets (parentheses) are used with arrays, both to declare them and to get a value at a given index in one of them. Visual Basic uses round brackets to define the parameters of subroutines or functions.
VBA itself is an [[Interpreter (computing)|interpreted] language. Precompilation is only used for syntax-check and to build tables for the variables used. Therefore VBA cannot be used to create standalone executables. Interpretation also causes the high memory requirement and low execution speed compaired with compiled programs.
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.
An array data structure can be mathematically modeled as an abstract data structure (an abstract array) with two operations get(A, I): the data stored in the element of the array A whose indices are the integer tuple I. set(A, I, V): the array that results by setting the value of that element to V. These operations are required to satisfy the ...
For instance, within the loop a reference to element I of an array would likely employ the auxiliary variable (especially if it were held in a machine register), but if I is a parameter to some routine (for instance, a print-statement to reveal its value), it would likely be a reference to the proper variable I instead. It is best to avoid such ...