std::strncpy

 

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

 

Defined in header <cstring>
char *strncpy( char *dest, const char *src, std::size_t count );

Copie a personaggi più count della stringa di byte puntata da src (compreso il carattere di terminazione null) a matrice di caratteri puntato da dest.

Original:

Copies at most count characters of the byte string pointed to by src (including the terminating null character) to character array pointed to by dest.

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Se count viene raggiunto prima della src intera stringa è stato copiato, l'array di caratteri risultante non è con terminazione null.

Original:

If count is reached before the entire string src was copied, the resulting character array is not null-terminated.

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Se, dopo aver copiato il carattere nullo di terminazione da src, count non viene raggiunto, ulteriori caratteri nulli vengono scritti dest fino al totale di caratteri count sono stati scritti.

Original:

If, after copying the terminating null character from src, count is not reached, additional null characters are written to dest until the total of count characters have been written.

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Se le stringhe si sovrappongono, il comportamento non è definito.

Original:

If the strings overlap, the behavior is undefined.

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Parametri

dest	-	puntatore alla matrice di caratteri da copiare Original: pointer to the character array to copy to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
src	-	puntatore alla stringa di byte da copiare Original: pointer to the byte string to copy from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	il numero massimo di caratteri da copiare Original: maximum number of characters to copy 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

dest

Esempio

#include <iostream>
#include <cstring>
 
int main()
{
    const char* src = "hi";
    char dest[6] = {'a', 'b', 'c', 'd', 'e', 'f'};;
    std::strncpy(dest, src, 5);
 
    std::cout << "The contents of dest are: ";
    for (char c : dest) {
        if (c) {
            std::cout << c << ' ';
        } else {
            std::cout << "\\0" << ' ';
        }
    }
    std::cout << '\n';
}

Output:

The contents of dest are: h i \0 \0 \0 f

Vedi anche

strcpy	copia una stringa in un'altra Original: copies one string to another The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
memcpy	copia un buffer all'altro Original: copies one buffer to another The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
C documentation for strncpy