A nickel is worth 5 cents (or pence :) and a dime is worth 10 cents. Quarters are 25 cents. Coins are used for amounts under a dollar; bills for everything a dollar and over.
-B On Dec 22, 2010, at 8:21 PM, Sayth Renshaw <[email protected]> wrote: > > > On Thu, Dec 23, 2010 at 2:26 AM, Todd O'Bryan <[email protected]> wrote: > I just realized something. You probably speak British (or at least > un-American) English. One of my former students from Manchester said > the first two weeks of math were very confusing because what we call > parentheses he called brackets and what we called brackets, he called > something else. > > Here's an English to English dictionary: > > ( and ) = open and close parentheses > [ and ] = open and close brackets > { and } = open and close (curly-)braces > > You tend to use parentheses in Racket, except in some special forms, > which use brackets instead. (These occur when you'd have a couple of > parentheses in a row and are just there to make visual parsing > easier.) > > Hope that helps, > Todd > > On Wed, Dec 22, 2010 at 10:22 AM, Todd O'Bryan <[email protected]> wrote: > > Here's an algorithm for converting from "normal math" to Racket. > > > > Write your expression: > > > > people * ticket-price - (number-of-shows * 20 + people * ticket-price) > > > > Notice that I didn't put parentheses anywhere that order of operations > > didn't require them. > > > > Now, add exactly one pair of parentheses for every operator that > > doesn't have one. Make sure you don't add too many and make sure you > > don't add too few. You should end up with the same number of operators > > as pairs of parentheses: > > > > ((people * ticket-price) - ((number-of-shows * 20) + (people * > > ticket-price))) > > > > Notice 5 operators (*, -, *, +, and *), 5 open parens, and 5 close parens. > > > > Now, move each operator to right after the open paren of the pair that > > encloses it. In other words, I'll move the first * to in front of > > people (i.e. after the second open parenthesis), but the - will move > > after the first open parenthesis. > > > > (- (* people ticket-price) (+ (* number-of-shows 20) (* people > > ticket-price))) > > > > Don't worry. This gets much easier with practice. > > > > Todd > > > > On Wed, Dec 22, 2010 at 5:44 AM, Sayth Renshaw <[email protected]> > > wrote: > >> What I am having trouble navigating is the brackets. > >> > >> Simply in normal math what I am trying to do is > >> > >> (people * ticket price)-((number of shows * 20)+(people * cost per person)) > >> > >> Contrcat : total profit : attendees performance -> number > >> > >> ;; Purpose to calculate total profit of a theatre per show > >> > >> ;;Example: (total profit 20 1) should produce $70 > >> > >> ;;Defintion: ( define (- profit cost)) > >> (* patrons 5( - (* patrons 0.5(+ (* shows 20))))) > >> > >> (define (patrons p) > >> ;p a number > >> ... > >> ) > >> > >> (define (shows s) > >> ;s a number > >> ... > >> ) > >> > >> (define (total_profit p s) > >> (* p 5( - (* p 0.5(+ s 20))))) > >> > >> > >> > >> _________________________________________________ > >> For list-related administrative tasks: > >> http://lists.racket-lang.org/listinfo/users > >> > > > > Thanks for the tip on the parentheses. Having a close and open without an > operator " ) ( " between them really through me. Yes I speak > Australian/British English this hasn't been too much of a hurdle though in > HTDP I wont be doing Ex 2.3.1 as I have no idea about nickels and dimes. The > book is very good regardless of that minor localisation. > > Sayth > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users
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