Download Icon programming language handbook by Christopher T.W PDF

By Christopher T.W

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10 Records You can create new record data types in Icon, just as you can in Pascal (records), C (structs), and C++ (classes). ,fn) where • rname is the name being given to the record type. , fn are the names being given to the fields (members) of the record. • the record declaration is only permitted outside of procedure declarations. For example record Point(x,y) might be used to define a point in a two-dimensional coordinate system. A point may be created by the expression: r := Point(1,2) which will create a new record of type Point, initialize its x field to 1 and its y field to 2, and assign the point record to variable r.

In order, for i from 1 to n, Icon compares the value of expression e1 to the values generated by expression e2i . • the comparison operator for the equality comparison is the universal equality test, ===. If it is given two numbers, it performs a numeric test; if two strings, a string test. For other kinds of objects, it tests to see whether they are the same object or not. Copyright © 1996. Thomas W. 6 • as soon as Icon finds a value equal to some value generated by an e2i , it evaluates e2n+1 to yield the values of the case expression.

Example: L:=list(2,[1]) write(if L[1] === L[2] then "equal" else "not equal") will write equal since the occurrence of [1] in the list function is evaluated just once, creating one list, which is assigned to both elements of L. 6 Differences between lists and strings Here are some differences between lists and strings: There are string literals. There are no list literals. Lists are mutable values; strings are immutable. This means you can change an element of a list and see that change in all the lists equal (===) to it.

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