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Varianti

while loop

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C++
 
Linguaggio C + +
Temi generali
Original:
General topics
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Controllo del flusso
Original:
Flow control
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Dichiarazioni esecuzione condizionale
Original:
Conditional execution statements
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Iterazione dichiarazioni
Original:
Iteration statements
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while loop
do-while loop
Vai dichiarazioni
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Jump statements
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Funzioni
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Functions
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dichiarazione di funzione
lambda funzione dichiarazione
funzione di modello
specificatore inline
eccezioni specifiche (deprecato)
noexcept specificatore (C++11)
Eccezioni
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Exceptions
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Spazi dei nomi
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Namespaces
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Tipi
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Types
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decltype specifier (C++11)
Specifiers
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Specifiers
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cv specificatori
Durata di stoccaggio specificatori
constexpr specificatore (C++11)
specificatore auto (C++11)
alignas specificatore (C++11)
Inizializzazione
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Initialization
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Letterali
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Literals
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Espressioni
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Expressions
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rappresentazioni alternative
Utilities
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Utilities
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Tipi
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Types
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typedef declaration
Tipo alias dichiarazione (C++11)
attributi (C++11)
Lancia
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Casts
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conversioni implicite
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Fusione C-stile e funzionale
Occupazione della memoria
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Memory allocation
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Classi
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Classes
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Specifiche per una classe di funzioni proprietà
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Class-specific function properties
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esplicito (C++11)
statico
Funzioni membro speciali
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Special member functions
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Modelli
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Templates
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classe template
funzione di modello
modello di specializzazione
parametri confezioni (C++11)
Varie
Original:
Miscellaneous
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Montaggio in linea
 
Esegue un ciclo.
Original:
Executes a loop.
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Usato in cui il codice deve essere eseguito più volte, mentre una certa condizione è presente.
Original:
Used where code needs to be executed several times while some condition is present.
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Indice

[modifica] Sintassi

while ( cond_expression ) loop_statement

[modifica] Spiegazione

cond_expression deve essere un'espressione, il cui risultato è convertibile in bool. Si è valutata prima di ogni esecuzione di loop_statement, che viene eseguito solo se il cond_expression restituisce true.
Original:
cond_expression shall be an expression, whose result is convertible to bool. It is evaluated before each execution of loop_statement, which is only executed if the cond_expression evaluates to true.
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Se l'esecuzione del ciclo deve essere terminato ad un certo punto, <div class="t-tr-text"> Istruzione break
Original:
break statement
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può essere utilizzato come terminale dichiarazione.
Original:
If the execution of the loop needs to be terminated at some point,
Istruzione break
Original:
break statement
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</div> can be used as terminating statement.
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Se l'esecuzione del ciclo deve essere continuata alla fine del corpo del ciclo, <div class="t-tr-text"> Istruzione continue
Original:
continue statement
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può essere utilizzato come collegamento.
Original:
If the execution of the loop needs to be continued at the end of the loop body,
Istruzione continue
Original:
continue statement
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</div> can be used as shortcut.
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[modifica] Parole chiave

while

[modifica] Esempio

#include <iostream>
 
int main()
{
    int i = 0;
    while (i < 10) i++;
 
    std::cout << i << '\n';
 
    int j = 2;
    while (j < 9) {
        std::cout << j << " ";
        j += 2;
    }
}

Output: 

10
2 4 6 8
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/language/while&oldid=25999"