Ndezvipi date mhando muna Pascal?

Kana zvirongwa Pascal (Pascal) inofanira kusarudzwa mhando date Pascal chirongwa. The programmer zvakakosha kunzwisisa kuti kuti kumhanya ayo chirongwa nzvimbo yokuchengetera kwete chete zvikwata dzinounzwa mundangariro, asi mashoko apo izvi mirayiro kushanda.

All mhando date muna Pascal vanokamurwa muzvikwata zviviri: nyore uye anoruka. Nokuti mumwe mhando mashoko anopiwa mumwe nhamba bytes. Nokuti marudzi nyore vari: integer mhando (byte, integer, etc.), Material marudzi (chaiye, kuroorwa, etc.), Boolean (boolean), unhu mhando (kwaIsakari), akataura uye penguva mhando. Vose zvavo, kunze chaiye mhando vari ordinal marudzi uye vanoonekwa vari kuti vane shoma iine akarayira tsika. Somuenzaniso, imwe shanduka ane mhando byte, anogona kutora tsika kubvira 0 kusvika 255 zvichibatanidzwa. Kwakadaro Data mhando muna Pascal kubvumira kushandisa mashandiro Pred (anoti dzakamboitika ukoshi) uye Succ (computes unozotevera ukoshi), Low (vychislyaetet duku ukoshi mhando) uye High (anoti chikuru ukoshi mhando), Ord (ref anoti mamiriro kukosha shanduka nhamba).

Neimwe somunhu nyore mhando tsika ane chete datum, i.e. imwe integer, munhu fractional nhamba kana chiratidzo. Variables vane nyore mashoko nemifananidzo, Pascal inofanira inorondedzerwa chikamu hadde (pfupi pamusoro Variables -. Variables).

The shanduka muchirongwa Pascal vaiona kuti zvakazara wainyatsotaura, kana ine zita (ID), mhando uye kutanga ukoshi. The zita shanduka rinoshandiswa kureva nazvo chero opareta. The date mhando kutaura zvakawanda mufananidzo (izvo zvinogona kutora shanduka tsika), kushanda nayo anogona kubatanidzwa, uwandu ndangariro inodiwa yokuchengeta shanduka achiyeukwa. Naizvozvo, kuti vagadzirise dambudziko vanofanira vanowanzotevedzera kuderedza uwandu variables uye ndaisagona vakasarudzwa pakubhadhara.

Muronga marudzi uri akarayira akagadzirwa variables pakubhadhara nyore. Idzi dzinosanganisira: kuko (kuko), nemhando (akaisawo), tambo (tambo), mafaira (faira), zvinyorwa (chinyorwa). Muronga date mhando muna Pascal vanorondedzerwa chikamu mhando (chikamu mhando tsananguro).

Array - mhando dzakawanda zvinowanzovapo anoruka, rinoshandiswa kana uchida kuchengeta uye dzinoona akarayira akagadzirwa variables zvakafanana mhando (chero nyore mhando). Arrays tiri umwe-dimensional, mbiri-dimensional, Multi-dimensional. Muenzaniso mumwe chete-dimensional kuko inogona mazita vadzidzi mumagazini mukirasi, arongwe mu earufabheti, apo mudzidzi mumwe nomumwe ane yakasiyana Serial nhamba. Muenzaniso mbiri-dimensional vakarongedza - nzvimbo zvigaro mu mabhaisikopu horo (chigaro nomumwe vagara vandifungira nezviyero zviviri - mutsara uye chigaro nhamba nhamba).

Chinobatanidza kusafanana disordered siyana, uye uwandu zvinhu ndeyevanyori 255. The tambo ine ane akarayira yakatarwa pazvinhu uye kwazvo zvakafanana hondo, zvisinei, chete zviratidzo zvinogona zvenyaya mutsetse.

File - ndiwo mumitsetse chete, asi uwandu nezvinhu zvinogona kuchinja mararamiro purogiramu. Kutsikisa ari mamwe marudzi akasiyana mashoko.

Nokudzidza kushandisa mashoko mhando muna Pascal, anogona chinozoiswa zvikuru kunzwisisa uye dzinonakidza mabasa.