Namespace
Varianti

return statement

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C++
 
Linguaggio C + +
Temi generali
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General topics
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Controllo del flusso
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Flow control
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Dichiarazioni esecuzione condizionale
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Conditional execution statements
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Iterazione dichiarazioni
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Iteration statements
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Vai dichiarazioni
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Jump statements
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goto statement
return statement
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
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Miscellaneous
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Montaggio in linea
 
Termina funzione corrente e restituisce il valore specificato per la funzione chiamante.
Original:
Terminates current function and returns specified value to the caller function.
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Indice

[modifica] Sintassi

return expression (1)
return (2)

[modifica] Spiegazione

La prima versione della valuta expression, termina la funzione corrente e restituisce il risultato del expression alla funzione chiamante. Il tipo risultante della expression deve essere convertibile per un funzionamento tipo di ritorno.
Original:
The first version evaluates the expression, terminates the current function and returns the result of the expression to the caller function. The resulting type of the expression must be convertible to function return type.
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La seconda versione termina la funzione corrente. Valido solo se il tipo di ritorno funzione è void.
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The second version terminates the current function. Only valid if the function return type is void.
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[modifica] Parole chiave

return

[modifica] Esempio

#include <iostream>
 
void fa(int i) 
{
    if (i == 2) return;
    std::cout << i << '\n';
}
 
int fb(int i) 
{
    if (i > 4) return 4;
    std::cout << i << '\n';
    return 2;
}
 
int main() 
{
    fa(2);
    fa(1);
    int i = fb(5);
    i = fb(i);
    std::cout << i << '\n';
}

Output: 

1
4
2
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/language/return&oldid=25981"