Get Constraint Logic Programming: Selected Research PDF

By Frédéric Benhamou, Alain Colmerauer

ISBN-10: 0262023539

ISBN-13: 9780262023535

Constraint common sense programming, the inspiration of computing with partial details, is turning into well-known as a fashion of dramatically enhancing at the present iteration of programming languages. This assortment offers the easiest of present paintings on all elements of constraint common sense programming languages, from concept via language implementation.

starting within the mid-1980s constraint common sense programming turned a robust and crucial theoretical proposal whose first functional program was once the improvement of effective programming languages in accordance with Prolog. Benhamou and Colmerauer have taken care to demonstrate the robust hyperlinks among present examine and latest CLP languages. the 1st a part of the publication makes a speciality of major theoretical reports that suggest normal types for constraint programming, and the 2 following elements enhance present rules on subject matters derived from those languages (numerical constraints, Booleans, and different finite domains). The concluding half on CLP language layout gathers paintings on unique constraints and on top-level implementation.

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Declaring variables Once the type of our variables has been chosen, we need to name them. We can imagine them as storage boxes with a name on the outside and a number (value) inside. The value may change as the program works through its sequence of operations, but the name is fixed. The programmer is free to choose the names, and we recommend choosing meaningful ones rather than cryptic ones. But, as in most programming languages, there are certain rules that must be followed. In Java, names: n must start with a letter (A to Z, a to z) or (unusually) an underscore ‘_’; n can contain any number of letters or digits (a digit is 0 to 9); n can contain the underscore ‘_’; n can be up to 255 characters long.

N arcs (sectors of a circle); n raised (three-dimensional) rectangles; n rectangles with rounded corners; n polygons. QXD 2/11/10 1:30 PM Page 28 Chapter 3 n Using graphics methods 28 Additionally, we can draw solid shapes with fillRect and fillOval. Their parameters are identical to those of the draw equivalents. • Drawing with colours It is possible to set the colour to be used for drawing. There are 13 standard colours: black gray orange yellow blue green pink cyan lightGray red darkGray magenta white (cyan is a deep green/blue, and magenta is a deep red/blue).

The transmission of an event (such as a mouseclick) to a program does not happen automatically. Instead, the program has to be set up to ‘listen’ for types of event. Fortunately, the coding for this is standard, and you will reuse it from program to program rather than creating it anew for every program. Responding to an event is known as ‘handling’ the event. Here is a program which provides a button. 1 shows the screenshot. 1 Screenshot of DrawExample program, after clicking on the button. drawLine(0, 0, 100, 100); } } The user clicks on the button, and a diagonal line is drawn.

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Constraint Logic Programming: Selected Research by Frédéric Benhamou, Alain Colmerauer

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