Chapter 4: Thinking Like a Programmer

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Charles O’Brien’
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1 Cha 4: Thnkng Lk a Pga Pag 53 Cha 4: Thnkng Lk a Pga On f h had hng lan hw hnk lk a ga. A ga n cad by l bk cla b gw f whn an ndvdal. T bc a "gd" ga ak an f chnlgy, lf lanng, bac nllgnc, and a dv ca and xl. Y a lk h ga xl Chh Clb, Nl Ang, and Y Gagan (h f han n ac). Y hav an nld nv xl and ca whn h c. Th nly cn n wh y can g wll b y cavy and wllngn lan. A ga dvl a ga nng alcan can fn xcd val hand ln f c cd. Th can vy qckly bc vwhlng, vn h xncd ga. Ofn w ga wll aach a clx bl ng a h c, lk: Thnk ab h bl. Bak h bl n c and w h dwn fally. Cnv h c n h c langag y a ng. Pdcd: Pdcd a fancy wd f wng, by, wha y ga nd b dng. Th wd dcd c f h Gk fx "d-" anng fak and "cd" f h acal c gang an. I n cad f h c dcly b ad hl y ndand h clxy f a bl and bak dwn n anngfl c. Th n ngl b way w dcd. Dzn f andad x

2 Cha 4: Thnkng Lk a Pga Pag 54 and ach n f h vy d f a acla y f bl. In h ndcn w wll l Englh an ndand bl. Hw wld y g ab wng a l ga daw a chl b (lk n Illan 13)? Illan 13: Schl B L' bak h bl n w : daw h whl daw h bdy Nw l' bak h nal n all c and w dcd: S cl black. Daw bh whl. S cl yllw. Daw bdy f b. Daw h fn f b. Tabl 4: Schl B - Pdcd

3 Cha 4: Thnkng Lk a Pga Pag 55 Nw ha w hav ga wkd, all w nd d w : S cl black. Daw bh whl. S cl yllw. Daw bdy f b. Daw h fn f b. cl black ccl 50,120,20 ccl 200,120,20 cl yllw c 50,0,200,100 c 0,50,50,50 Tabl 5: Schl B - Pdcd wh BASIC-256 San Th cld chl b ga (Pga 25) ld blw. Lk a h fnhd ga and y wll cn an d n h ga hl h ga b h d dng h nal bl lvng # c4_chlb.kb # daw a chl b clg # daw whl cl black ccl 50,120,20 ccl 200,120,20 # daw b bdy cl yllw c 50,0,200,100 c 0,50,50,50 Pga 25: Schl B In h chl b xal w hav j n h w any dffn way

4 Cha 4: Thnkng Lk a Pga Pag 56 bak h bl. Y cld hav dawn h b f and h whl la, y cld hav dawn h fn bf h back,... W cld l dzn f dffn way h l bl cld hav bn ackld. On vy an hng b, THERE IS NO WRONG WAY aach a bl. S way a b han h (fw ncn, a ad, ), b h an hng ha y lvd h bl. Flwchang: Anh chnq ha ga ndand a bl calld flwchang. Fllwng h ld adag f "a c wh a hand wd", ga wll daw a daga nng h lgc f a ga. Flwchang n f h ld and cnly d hd f dawng h c. Th bf ndcn flwcha wll nly cv a all a f wha ha can b dn wh h, b wh a fw l ybl and cnnc y wll b abl dl vy clx c. Th chnq wll v y wll n nly n gang b n lvng any bl y wll c ac. H a a fw f h bac ybl:

5 Cha 4: Thnkng Lk a Pga Sybl Pag 57 Na and Dcn Flw An aw n vng f n ybl n h c anh. Y fllw h dcn f h awhad. Tna Tna Th ybl ll wh a and fnh h flwcha. Each flwcha hld hav w f h: a a and a fnh. Pc Pc Th ybl n acv acn ha h ga wll nd ak. Th hld b nly n aw lavng a c. In and O In and O (I/O) Th ybl n daa bng ad by h y bng wn f h y. An xal wld b avng ladng fl. Dcn Dcn Th dcn dand ak a l y/n /fal qn. Th hld b w aw ha lav a dcn. Dndng n h l f h qn w wll fllw n ah f h dand. Tabl 6: Enal Flwchang Sybl Th b way lan flwcha lk a xal and y y wn hand. Flwchang Exal On: Y j lld f bd and y ha gvn y w chc f bakfa. Y can hav y fav cld cal a cabld gg. If y d n ch n f h n y can g chl hngy.

6 Cha 4: Thnkng Lk a Pga Pag 58 Sa N Y Cal? G bwl, lk, and cal. N Y Scabld gg? Fx gg. Ea. Fnh Illan 14: Bakfa - Flwcha Tak a lk a Illan 14 (abv) and fllw all f h aw. D y hw ha c n h cna?

7 Cha 4: Thnkng Lk a Pga Pag 59 Flwchang Exal Tw: Anh fd xal. Y a hy and wan a da f h achn. Tak a lk a Illan 15 (blw). Sa N Y D w hav ngh chang f h achn? In cn. N Y Hav w Ind ngh? Mak lcn. N Y Sld? G can. G chang f any. Dnk. Fnh Illan 15: Sda Machn - Flwcha

8 Cha 4: Thnkng Lk a Pga Pag 60 Nc n h cnd flwcha ha h a a cl f ha w ay nd a a c. Y hav n n hw d ha n BASIC-256, b wll b cvd n h nx fw cha.

9 Cha 4: Thnkng Lk a Pga Pag 61 Exc: z y x z a q f b g d d q f l n k h y w c z c w c q h l c b a h a d b f a x l l v g n w n d q b n a dcn, flwcha, n,, bl, c, gang, dcd,, ybl, na 4.1. In cl nnc can y w h ak a an b and jlly andwch. A ha h an b ja, jlly ja, laf f bad, lac, and lvwa a n h abl n fn f y. Can anh n, wh ha nv n a PBJ, ccflly ak n ng y dcn? 4.2. In a flw cha ( n a la daga) daga h c y g hgh n h fn d f y h aan. D y hav y ky? I h d lckd? I alady n? 4.3. In dcd (h an) can y w dcn f y chl wk h na aan ga an. Dn' cha and lk h dcn n-ln. Wll h a dcn g y back h a way d h ncn nd b changd?

10 Cha 4: Thnkng Lk a Pga Pag 62

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