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Algoritmi: Structura Repetitiva


CorinA

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Prin aceasta structura se exectuta repetat o actiune sau o secventa de actiuni,atat timp cat conditia precizata este adevarata.

Executarea repetata a unei actiuni este un concept algoritmic foarte important.Metoda de implementare este structura repetitiva(=interativa) cunoscuta sub numele de ciclu sau bucla (loop) in care corpul ciclului (=iteratie) se executa repetat sub un porces de control :

testeaza conditie

executa corpul ciclului

testeaza conditie

executa corpul ciclului

..............................

testeaza conditie pana cand conditia nu mai este indeplinita

Procesul de control cuprinde 3 actiuni:

  • Initializarea
  • Testarea
  • Modificarea

INITIALIZAREA:

s <-- 0 (citeste a)

s <-- 0 si i <-- 1

TESTAREA:Compara starea curenta cu starea finala.Daca cele doua sunt egale,procesul se termina.

1.Se compara a cu 0 ( a<>0 ) --> se repeta atat timp cat operatorul furnineaza valoarea "adevarat"

2.Procesul de executare repetata se termina cand a=0

MODIFICAREA:Schimba starea curenta --> starea finala.Aceasta actiune face parte din corpul ciclului.

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