std::strerror

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Stringhe libreria

Null-stringhe terminate Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Byte stringhe

Multibyte stringhe

Stringhe larghe

Classi Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

Null-stringhe terminate byte

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Carattere manipolazione Original: Character manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
isalnum isalpha islower isupper isdigit isxdigit isblank (C++11)	iscntrl isgraph isspace isprint ispunct tolower toupper
Le conversioni in formati numerici Original: Conversions to numeric formats The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
atof atoi atol atoll strtol strtoll	strtoul strtoull strtof strtod strtold
Della gestione delle stringhe Original: String manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strcpy
strncpy
strcat
strncat
strxfrm
String esame Original: String examination The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strlen strcmp strncmp strcoll strchr strrchr	strspn strcspn strpbrk strstr strtok
Memoria manipolazione Original: Memory manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
memchr
memcmp
memset
memcpy
memmove
Varie Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strerror

 

Elemento definito nell'header <cstring>
char* strerror(int errnum );

versione testo Restituisce il codice di errore errnum. errnum di solito è acquisito dalla variabile errno, tuttavia la funzione accetta qualsiasi valore di int tipo. Il messaggio è specifica delle impostazioni locali.

Original:

Returns text version of the error code errnum. errnum is usually acquired from the errno variable, however the function accepts any value of type int. The message is locale-specific.

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La stringa di byte restituito non deve essere modificato dal programma, ma può essere sovrascritto da una chiamata successiva alla funzione strerror.

Original:

The returned byte string must not be modified by the program, but may be overwritten by a subsequent call to the strerror function.

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Parametri

errnum

-

valore integrale riferimento a un errore codice Original: integral value referring to a error code The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

Puntatore a una stringa con terminazione null byte corrispondente al codice di errore errnum.

Original:

Pointer to a null-terminated byte string corresponding to the error code errnum.

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Esempio

#include <iostream>#include <cmath>#include <cerrno>#include <cstring>   int main(){double not_a_number =std::log(-1.0);if(errno==EDOM){std::cout<<"log(-1) failed: "<< std::strerror(errno)<<'\n';}}

Output:

log(-1) failed: Numerical argument out of domain

Vedi anche

E2BIG, EACCES, ..., EXDEV	macro per standard POSIX compatibili con le condizioni di errore Original: macros for standard POSIX-compatible error conditions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (macro costante)
C documentation for strerror