Download Elementary standard ML by Gregory Michaelson PDF
By Gregory Michaelson
"In this new and authoritative textbook the basic good points of SML are taught with using wide useful examples and routines. The ebook should be perfect for a primary point direction in useful programming, proposing the practical paradigm as an invaluable process in its personal correct, in addition to supporting to strengthen an figuring out of thoughts which are extra commonly appropriate, reminiscent of trend matching, case Read more...
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We will use them to represent property values. We will also briefly consider tuples as a way of making things as groups of fixed numbers of property values. 2 Expressions and types SML programs consist of function definitions and expressions that use the defined functions. We will see how expressions are formed as the book progresses. At its simplest, an expression may be a value from a basic type. Types and typing are central to SML, as we shall see. They enable thorough checks on whether operations and functions are put together correctly.
3) Given the following table of people: name Chris pat Jo Chris Pat Jo sex female male female male female male age 22 17 21 20 19 18 swims yes no yes yes no yes describe how to solve the following problems in terms of doing something to the first entry having done something to the rest of the entries, or doing something with no entries: THINGS, COLLECTIONS AND PROPERTIES a) count how many female people swim b) find the ages of all the male people who don’t swim c) find the names and sexes of all the people whose ages are at least 20 d) find the total age of all the people e) find the total age of all the people called Jo f) find the total age of all the female people who swim g) count how many people are called Pat and are less than 20 h) count how many people are called Pat or called Jo i) check if everyone swims j) check if everyone swims or is called Jo k) check if everyone who is male also swims l) check if everyone who is female is also over 19 In each case, check your description by working through it by hand.
15 Tuple type operators div and mod are really special SML notation for operators which apply to tuples of two integers. The function op is used to convert such special operators into functions on tuples. For example: – (op div) (126, 3); > 42 : int is the same as: – 126 div 3; > 42 : int Similarly: – (op mod) (97, 55); > 42 : int is the same as: – 97 mod 55; > 42 : int Thus, we can use op to convert such operators into functions and thence display their types. For example: – op div; > fn : int*int -> int and: – op mod; > fn : int*int -> int shows that op div and op mod are functions from int * int domains to int ranges.