visual .net bar code Development of sequential programs in Software Generator Data Matrix ECC200 in Software Development of sequential programs

Development of sequential programs using none touse none in web,windows applicationbarcode support alphanumeric It is easy to se none none e that a can be instantiated to 0 and b to n. As a result, we have for free the following program calculating the square root of n: square_root_program r, q := 0, n; while r = q do if n < ((r + 1 + q)/2)2 then q := (r + 1 + q)/2 1 else r := (r + 1 + q)/2 end end. PDF417 15.11.6 Second i nstantiation If we take for f the function multiply by m , where m is a positive natural number, then the computation will provide the integer division of n by m.

More precisely, we shall compute a quantity r such that: m r n < m (r + 1) We have thus to prove that this function is total and increasing, which is trivial. Now, given a value n we have to nd two numbers a and b such that: m a n < m (b + 1). It is easy to see that a can be instantiated to 0 and b to n (remember, m is a positive natural number).

As a result, we have for free the following program calculating the integer division of n by m: integer_division_program r, q := 0, n; while r = q do if n < m (p + 1 + q)/2 then q := (r + 1 + q)/2 1 else r := (r + 1 + q)/2 end end .. 16 A location access controller The purpose of t his chapter is to study yet another example dealing with a complete system like the one we studied in 2, where we controlled cars on a bridge, and in 3, where we studied a mechanical press controller. The system we study now is a little more complicated than the previous ones. In particular, the mathematical data structure we are going to use is more advanced.

Our intention is also to show that during the reasoning on the model we shall discover a number of important missing points in the requirement document.. 16.1 Requirement none for none document We shall construct a system which will be able to control the access of certain people to di erent locations of a workplace ; for example, a university campus, an industrial site, a military compound, a shopping mall, etc. Thus:.

The system concerns people and locations FUN-1. The control take s place on the basis of the authorization that each person concerned is supposed to possess. This authorization should allow him, controlled by the system, to penetrate into certain locations, and not into others. For example, a certain person p1 is authorized to enter location l1 and not location l2 ; however, another person p2 is allowed to enter both locations.

These authorizations are given on a permanent basis; in other words, they will not change during a normal functioning of the system:. People are perma none for none nently assigned the authorization to access certain locations FUN-2. A location access controller A person who is in a location must be authorized to be there FUN-3. When someone is none none inside a location, his eventual exit must also be controlled by the system, so as to be able to know at any moment who is inside a given location. Each person involved receives a magnetic card with a unique identifying sign, which is engraved on the card itself: Each person receives a personal magnetic card EQP-1. Card readers are installed at each entrance and at each exit of the locations concerned. Near to each reader, two control lights can be found: a red one and a green one. Each one of these lights can be on or o : Each entrance and exit of a location is equipped with a card reader EQP-2.

Each card reader has two lights: one green light and one red light EQP-3. Each light can be on or o . EQP-4. The transfer of none none people from one location to another takes place thanks to turnstiles which are normally blocked; nobody can get through them without being controlled by the system, any person getting through is detected by a sensor: Locations communicate via one-way turnstiles EQP-5. Each turnstile i s dedicated to a single task, either entry or exit; there are no two-way turnstiles. Turnstiles and card readers are illustrated in Fig. 16.

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