Software Development

Modula-2 Applied by R. J. Mitchell (auth.)

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By R. J. Mitchell (auth.)

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The format is: VAR namel : TYPEl, name : TYPE2, etc. A few valid declarations are given below: VAR x : NUMBER VAR x : NUMBER, y : NUMBER, array VAR anotherarray : ARRAY [1*7, x] ARRAY [1,9] 'note dynamic array size. Assignments are of the form: variable := expression where the variable can be a number or an array suitably indexed, and the expression one which returns a value of type NUMBER; or the variable can be an array, and the expression another array, or a series of numerical expressions separated by commas and enclosed with [ and ].

Ctrl-Home, Ctrl-PgUp, etc. move by even larger amounts. (Ctrl-xxx means holding down the Ctrl key and pressing the xxx key). At any time when editing, the user can look in more detail at part o/the diagram by pressing the Ins key, and zoom out by pressing the Del key. In each case the current position becomes the centre o/the window. To recentre around the current position, the user presses the * key. Group commands The group commands allow the user to select a group of items for processing. The processing options are to move the selected items, copy them, draw a mirror image, delete them, or install them as a usershape.

The one exception to the rule is that two variables of the same name cannot be in scope at the same time. For example, if a procedure has a procedure local to it, both procedures cannot have a local variable, or be passed a parameter, of the same name. This was done to simplify the analyser. Identifiers (names of variables and procedures) must begin with a letter, and can be followed by any number of letters or digits. Identifiers are case sensitive. The variable types allowed are NUMBER (which is a REAL), and ARRAY (which is an array, between limits specified by the user, of NUMBER).

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