Namespace
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strstr

Da cppreference.com.
< c‎ | string‎ | byte

 
 
 
Null-stringhe terminate byte
Funzioni
Original:
Functions
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Carattere manipolazione
Original:
Character manipulation
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Le conversioni in formati numerici
Original:
Conversions to numeric formats
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Della gestione delle stringhe
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
String esame
Original:
String examination
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Memoria manipolazione
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Varie
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Miscellaneous
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strerror
 
Defined in header <string.h>
const char *strstr( const char* str, const char* substr );
      char strstr(        char* str, const char* substr );
Trova la prima occorrenza del substr stringa di byte nella stringa di byte puntato da str.
Original:
Finds the first occurrence of the byte string substr in the byte string pointed to by str.
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Indice

[modifica] Parametri

str -
puntatore alla stringa con terminazione null byte da esaminare
Original:
pointer to the null-terminated byte string to examine
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substr -
puntatore alla stringa con terminazione null byte da ricercare
Original:
pointer to the null-terminated byte string to search for
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[modifica] Valore di ritorno

Puntatore al primo carattere della sottostringa trovato in str, o in mancanza di NULL sottostringa non viene trovato. Se substr punta a una stringa vuota, viene restituito str.
Original:
Pointer to the first character of the found substring in str, or NULL if no such substring is found. If substr points to an empty string, str is returned.
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[modifica] Esempio

#include <string.h>
#include <stdio.h>
 
void find_str(char const* str, char const* substr) 
{
    char* pos = strstr(str, substr);
    if(pos) {
        printf("found the string '%s' in '%s' at position: %d\n", substr, str, pos - str);
    } else {
        printf("the string '%s' was not found in '%s'\n", substr, str);
    }
}
 
int main(int argc, char* argv[]) 
{
    char* str = "one two three";
    find_str(str, "two");
    find_str(str, "");
    find_str(str, "nine");
    find_str(str, "n");
 
    return 0;
}

Output:

found the string 'two' in 'one two three' at position: 4
found the string '' in 'one two three' at position: 0
the string 'nine' was not found in 'one two three'
found the string 'n' in 'one two three' at position: 1

[modifica] Vedi anche

trova la prima occorrenza di un carattere
Original:
finds the first occurrence of a character
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(funzione) [edit]
trova l'ultima occorrenza di un carattere
Original:
finds the last occurrence of a character
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(funzione) [edit]