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Prof.ssa Mariaelena Crescenzi
Docente di INFORMATICA
LINGUAGGIO C++:
Istruzioni di Controllo
LINGUAGGIO C++
Le istruzioni
ISTRUZIONI
OPERATIVE DI CONTROLLO
INPUT
ASSEGNAZIONE
OUTPUT ITERAZIONE
SEQUENZA
SELEZIONE
ISTRUZIONI DI CONTROLLO
Iterazione o ciclo
❖ Si utilizza quando un gruppo di istruzioni deve essere
eseguito finché non si verifica una determinata condizione
❖ Avviene l’esecuzione ripetuta di gruppi di istruzioni per un
determinato numero di volte o fino al raggiungimento di un
determinato risultato
ISTRUZIONI DI CONTROLLO
Costrutto iterativo precondizionale
V
F
<Blocco A>
<condizione>
❖ Il controllo della condizione (guardia del
ciclo) viene effettuato prima di eseguire
le istruzioni che compongono il ciclo
(corpo del ciclo)
Condizioni di ingresso
Condizioni di uscita
FINTANTOCHÈ si verifica la condizione,
ESEGUI il blocco A
ALTRIMENTI esci dal ciclo
Accumulatore x  x + 12
Contatore i  i + 1
Costrutto iterativo precondizionale
FINTANTOCHÈ si verifica la condizione
ESEGUI il blocco di istruzioni
ALTRIMENTI esci dal ciclo
while (<condizione>){
<istruzioni>
}
LINGUAGGIO C++
Esempio
Inserire un elenco di numeri, 0 per finire
int numero;
cout << "Inserire un numero (0 per finire)";
cin >> numero;
while (numero != 0) {
...
...
cout << "Inserire un numero (0 per finire)";
cin >> numero;
}

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Cpp 006 Crescenzi - Istruzioni di Controllo (parte2) - Iterazione 1.pdf

  • 1. Prof.ssa Mariaelena Crescenzi Docente di INFORMATICA LINGUAGGIO C++: Istruzioni di Controllo
  • 2. LINGUAGGIO C++ Le istruzioni ISTRUZIONI OPERATIVE DI CONTROLLO INPUT ASSEGNAZIONE OUTPUT ITERAZIONE SEQUENZA SELEZIONE
  • 3. ISTRUZIONI DI CONTROLLO Iterazione o ciclo ❖ Si utilizza quando un gruppo di istruzioni deve essere eseguito finché non si verifica una determinata condizione ❖ Avviene l’esecuzione ripetuta di gruppi di istruzioni per un determinato numero di volte o fino al raggiungimento di un determinato risultato
  • 4. ISTRUZIONI DI CONTROLLO Costrutto iterativo precondizionale V F <Blocco A> <condizione> ❖ Il controllo della condizione (guardia del ciclo) viene effettuato prima di eseguire le istruzioni che compongono il ciclo (corpo del ciclo) Condizioni di ingresso Condizioni di uscita FINTANTOCHÈ si verifica la condizione, ESEGUI il blocco A ALTRIMENTI esci dal ciclo Accumulatore x  x + 12 Contatore i  i + 1
  • 5. Costrutto iterativo precondizionale FINTANTOCHÈ si verifica la condizione ESEGUI il blocco di istruzioni ALTRIMENTI esci dal ciclo while (<condizione>){ <istruzioni> } LINGUAGGIO C++ Esempio Inserire un elenco di numeri, 0 per finire int numero; cout << "Inserire un numero (0 per finire)"; cin >> numero; while (numero != 0) { ... ... cout << "Inserire un numero (0 per finire)"; cin >> numero; }