Boolean data type

Type[G t) = Bool, bool standing for Boolean data type. 

The Boolean data type is used to represent variables that have only two possible states TRUE or FALSE. The Boolean objects available in LabVIEW include switches, push buttons, and LEDs. 

Logical—Data type w ith only two possible values True (represented as 1) and False (represented as 0), also referred to as Boolean. 

You can use other data types as Boolean variables. When a variable is used in a logical expression, zero is converted to False while any non-zero value is converted to True. Thus the expression... 

When Boolean variables are converted to other data types. False becomes zero but True is converted to -1. 

When other numeric data types are converted to Boolean values, 0 becomes False while all other values become True. When Boolean values are converted to other data types. False becomes 0 while True becomes -1. 

Dataflow organization the program is entered as a set of boxes coimected by wires, flowing from the input data on the left to the outputs orders on the right. The wires convey data aeeording to data types the boxes transform data by means of Boolean operators, numerie operators or by means of functions. All loops in the layout are precisely controlled using the previous operator. 

Behavioral descriptions for these applications usually contain various control structures such as conditional branches, loops and conditional jumps. In addition, they contain various data types such as bit strings, integer, boolean, arrays and records. In order to synthesize efficient circuits from such a behavioral description, it is important to deal with such structures cleverly, especially in scheduling and datapath allocation. However, most of conventional scheduling and allocation algorithms do not deal with such structures explicitly. 

LabVIEW provides a variety of controls and indicators. These controls and indicators simulate instmment inputs and outputs. Every control or indicator has a data type associated with it. The most commonly used data types are Boolean, numeric, and string. 

Lab VIEW supports arrays to be created. Arrays contain two or more elements of the same data type. In Lab VIEW, arrays can be created for any data type. Figure 5.11(a) shows a two-dimensional array of numeric controls. Lab VIEW permits up to (2—1) elements per dimension. The data in an array can be directly exported to an MS Excel worksheet. Arrays of Boolean, numeric, string, path, waveform, clusters, etc., can be built in LabVIEW. 

However, there are many instances where a variant allows one to do things that otherwise would be impossible. The power of a variant comes from the fact that it is a simple data element and yet can contain any—and that means any—type of data. It can be a string or a Boolean or an integer or a real number. Hence, when the data type returned by a function can vary, one is obligated to use a variant for the returned value. 

Most of these should be familiar from other languages. The data types of Lua are nil. Boolean, number, string, userdata, function, thread and table. 

The names shown are not exactly the string names stored in the G[] table but have been augmented at the end with a 2 character code to indicate which of the 8 fundamental Lua types of variable is stored in the table. For example the last two characters of [] indicate that the entry name refers to a table. The character codes and associated data types are string = number = function = table = userdata = thread = boolean = The entries in the G[] table are thus seen to be of type string, table or function. The use of most of the functions can be inferred from the names of the functions. 

The CD-ROM version of the data base can be efficiently searched with a menu-driven type of software called Search Express. It allows one to search with Boolean expressions as well as individual words and/or frequency of hits as a function of the number of documents retrieved on a given topic. Numerous searchable fields have been included, allowing one to retrieve information by a variety of means, for example, the compound name the chemical registry number, the amount of material released into the air, water, or land the location of the site of release and the SIC code of the releasing party. One can also employ ranging methods with available numeric fields and sorting of output. 

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