std::basic_string::find
De cppreference.com
<metanoindex/>
<tbody> </tbody> size_type find( const basic_string& str, size_type pos = 0 ) const; |
(1) | |
size_type find( const CharT* s, size_type pos, size_type count ) const; |
(2) | |
size_type find( const CharT* s, size_type pos = 0 ) const; |
(3) | |
size_type find( CharT ch, size_type pos = 0 ) const; |
(4) | |
Encontra a primeira substring igual a seqüência de caracteres. Pesquisa começa na
pos, ou seja, a substring encontrada não deve começar em uma posição anterior pos.Original:
Finds the first substring equal to the given character sequence. Search begins at
pos, i.e. the found substring must not begin in a position preceding pos.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
1)
Encontra a primeira substring igual a
str. Original:
Finds the first substring equal to
str. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
2)
Encontra a primeira substring iguais aos caracteres
count primeiro da cadeia de caracteres apontada por s. s pode incluir caracteres nulos.Original:
Finds the first substring equal to the first
count characters of the character string pointed to by s. s can include null characters.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
3)
Encontra a primeira substring igual à cadeia de caracteres apontada por
s. O comprimento da corda é determinada pelo primeiro caractere nulo.Original:
Finds the first substring equal to the character string pointed to by
s. The length of the string is determined by the first null character.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
4)
Localiza o
ch primeiro caractere.Original:
Finds the first character
ch.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Parâmetros
| str | - | string para procurar
Original: string to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| count | - | comprimento da substring a ser pesquisada
Original: length of substring to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| s | - | ponteiro para uma cadeia de caracteres de pesquisa para a
Original: pointer to a character string to seach for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| ch | - | caracteres para pesquisa
Original: character to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Valor de retorno
posição do primeiro caractere da substring encontrado ou se não
npos substring seja encontrado.Original:
position of the first character of the found substring or
npos if no such substring is found.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Exemplo
#include <string>
#include <iostream>
void print(std::string::size_type n, std::string const &s)
{
if (n == std::string::npos) {
std::cout << "not found\n";
} else {
std::cout << "found: " << s.substr(n) << '\n';
}
}
int main()
{
std::string::size_type n;
std::string const s = "This is a string";
// search from beginning of string
n = s.find("is");
print(n, s);
// search from position 5
n = s.find("is", 5);
print(n, s);
// find a single character
n = s.find('a');
print(n, s);
// find a single character
n = s.find('q');
print(n, s);
}
Saída:
found: is is a string
found: is a string
found: a string
not found