в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

Admin: 1 версия: Импорт контента...

2010-05-25T10:30:27Z

1 версия: Импорт контента...

Новая страница

==find first occurrence of a character - equivalent of strchr()==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
int main( )
{
string typing( "The quick, brown fox jumps over the lazy dog" );
cout << "String: " << typing << endl;
// find first occurrence of a character - equivalent of strchr()
string::size_type index = typing.find( "u" );
if( index != string::npos )
cout << "\nThe first \"u\" is at index " << index;
else
cout << "\nThere is no \"u\" in the string";
}</source>

==find first occurrence of a substring - equivalent of strstr()==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
int main( )
{
string typing( "The quick, brown fox jumps over the lazy dog" );
cout << "String: " << typing << endl;

// find first occurrence of a substring - equivalent of strstr()
string::size_type index = typing.find( "fox" );
if( index != string::npos )
cout << "\n\"fox\" first occurs at index " << index;
else
cout << "\n\"fox\" is not in the string";
}</source>

==Find first out of==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;

int main() {
string s1 = "this is a test";
int n;

n = s1.find_first_not_of("aeiouAEIOU");
cout << "First consonant at " << n << endl;
return 0;
}</source>

==find last occurrence of a character - equivalent of strrchr()==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
int main( )
{
string typing( "The quick, brown fox jumps over the lazy dog" );
cout << "String: " << typing << endl;

// find last occurrence of a character - equivalent of strrchr()
string::size_type index = typing.rfind( "u" );
if( index != string::npos )
cout << "\nThe last \"u\" is at index " << index;
else
cout << "\nThere is no \"u\" in the string";
}</source>

==find last occurrence of a substring - no C-string equivalent==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
int main( )
{
string typing( "The quick, brown fox jumps over the lazy dog" );
cout << "String: " << typing << endl;
// find last occurrence of a substring - no C-string equivalent
string::size_type index = typing.rfind( "fox" );
if( index != string::npos )
cout << "\n\"fox\" last occurs at index " << index;
else
cout << "\n\"fox\" is not in the string";
}</source>

==Find the first occurance==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;

int main() {
string s1 = "this is a test";
int n;

n = s1.find_first_of("is");
cout << n << endl;

return 0;
}</source>

==Find the first of any of these chars==

<source lang="cpp">#include <string>
#include <iostream>
int main( ) {
std::string s = "Search from the beginning";
std::cout << s.find_first_of("swi") // Find the first of any of these chars
<< "\n";
}</source>
<pre class=codeResult>19</pre>

==Find the first of any of these chars starting from the end==

<source lang="cpp">#include <string>
#include <iostream>
int main( ) {
std::string s = "Search from the beginning";
std::cout << s.find_last_of("abg") << "\n"; // Find the first of any of these chars starting from the end
}</source>
<pre class=codeResult>24</pre>

==Find the first that"s not in this set==

<source lang="cpp">#include <string>
#include <iostream>
int main( ) {
std::string s = "Search from the beginning";
std::cout << s.find_first_not_of("the") // Find the first that"s not in this set
<< "\n"; //
}</source>
<pre class=codeResult>0</pre>

==Find the first that"s not in this set, starting from the end==

<source lang="cpp">#include <string>
#include <iostream>
int main( ) {
std::string s = "Search from the beginning";
std::cout << s.find_last_not_of("from") // Find the first that"s not in this set, starting from the end
<< "\n";
}</source>
<pre class=codeResult>24</pre>

==search a sub string==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
int main()
{
int i;
string s1 ="this is a test.";
string s2;
i = s1.find("is");
if(i!=string::npos) {
cout << "Match found at " <
<pre class=codeResult>Match found at 2
Remaining string is:
is is a test.</pre>

==Search from the beginning==

<source lang="cpp">#include <string>
#include <iostream>
int main( ) {
std::string s = "Search from the beginning";
std::cout << s.find("ar") << "\n"; // Search from the beginning
}</source>
<pre class=codeResult>2</pre>

==Search from the end==

<source lang="cpp">#include <string>
#include <iostream>
int main( ) {
std::string s = "Search from the beginning";
std::cout << s.rfind("ar") << "\n"; // Search from the end
}</source>
<pre class=codeResult>2</pre>

==Searching for the first occurrence of a letter in a string==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
void showresult(string s, string::size_type i);
int main(){
string::size_type indx;
string str("one two three, one two three");
string str2;
cout << "Searching for the first occurrence of t or h\n";
indx = str.find_first_of("th");
showresult(str, indx);
return 0;
}
// Display the results of the search.
void showresult(string s, string::size_type i) {
if(i == string::npos) {
cout << "No match found.\n";
return;
}
cout << "Match found at index " <

==Searching for the first occurrence of any character other than o, n, e, or space==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
void showresult(string s, string::size_type i);
int main()
{
string::size_type indx;
string str("one two three, one two three");
string str2;
cout << "Searching for the first occurrence of any character other than o, n, e, or space\n";
indx = str.find_first_not_of("one ");
showresult(str, indx);
return 0;
}
// Display the results of the search.
void showresult(string s, string::size_type i) {
if(i == string::npos) {
cout << "No match found.\n";
return;
}
cout << "Match found at index " <

==Searching for the first occurrence of a substring in a string==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
void showresult(string s, string::size_type i);
int main()
{
string::size_type indx;
string str("one two three, one two three");
string str2;
cout << "Searching for the first occurrence of "two"\n";
indx = str.find("two");
showresult(str, indx);
return 0;
}
// Display the results of the search.
void showresult(string s, string::size_type i) {
if(i == string::npos) {
cout << "No match found.\n";
return;
}
cout << "Match found at index " <

==Searching for the last occurrence of a letter in a string==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
void showresult(string s, string::size_type i);
int main()
{
string::size_type indx;
string str("one two three, one two three");
string str2;
cout << "Searching for the last occurrence of t or h\n";
indx = str.find_last_of("th");
showresult(str, indx);
return 0;
}
// Display the results of the search.
void showresult(string s, string::size_type i) {
if(i == string::npos) {
cout << "No match found.\n";
return;
}
cout << "Match found at index " <

==Searching for the last occurrence of any character other than o, n, e, or space==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
void showresult(string s, string::size_type i);
int main()
{
string::size_type indx;
string str("one two three, one two three");
string str2;
cout << "Searching for the last occurrence of any character other than o, n, e, or space\n";
indx = str.find_last_not_of("one ");
showresult(str, indx);
return 0;
}
// Display the results of the search.
void showresult(string s, string::size_type i) {
if(i == string::npos) {
cout << "No match found.\n";
return;
}
cout << "Match found at index " <

==Searching for the last occurrence of a substring in a string==

<source lang="cpp">#include <iostream>
#include <string>
using namespace std;
void showresult(string s, string::size_type i);
int main()
{
string::size_type indx;
string str("one two three, one two three");
string str2;
cout << "Searching for the last occurrence of "two"\n";
indx = str.rfind("two");
showresult(str, indx);
return 0;
}
// Display the results of the search.
void showresult(string s, string::size_type i) {
if(i == string::npos) {
cout << "No match found.\n";
return;
}
cout << "Match found at index " <

==string.find_first_not_of( substring )==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "This is a test string!");
int location;

location = string1.find_first_not_of( "is" );
cout << "\n\n(find_first_not_of) "" << string1[ location ]
<< " " << location;
return 0;
}</source>
<pre class=codeResult>(find_first_not_of) "T 0"</pre>

==string.find_first_of( substring )==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "This is a test string!");
int location;

location = string1.find_first_of( "is" );
cout << "\n\n(find_first_of) found "" << string1[ location ]
<< "at: " << location;
return 0;
}</source>
<pre class=codeResult>(find_first_of) found "iat: 2"</pre>

==string.find_last_of(substring)==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "This is a test string!");
int location;

location = string1.find_last_of( "is" );
cout << "\n\n(find_last_of) found "" << string1[ location ]
<< " at: " << location;

return 0;
}</source>
<pre class=codeResult>(find_last_of) found "i at: 18"</pre>

==string.find(substring)==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "This is a test string!");
int location;

cout << "Original string:\n" << string1
<< "\n\n(find) \"is\" was found at: " << string1.find( "is" );

return 0;
}</source>
<pre class=codeResult>Original string:
This is a test string!
(find) "is" was found at: 2"</pre>

==string.rfind(substring)==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "This is a test string!");
int location;

cout << "Original string:\n" << string1
<< "\n\n(find) \"is\" was found at: " << string1.rfind( "is" );

return 0;
}</source>
<pre class=codeResult>Original string:
This is a test string!
(find) "is" was found at: 5"</pre>

==Using find with reverse iteration==

<source lang="cpp">#include <iostream>
#include <vector>
#include <algorithm> // for find
#include <iterator>
using namespace std;

int main()
{
string s("It is him.");
vector<char> vector1(s.begin(), s.end());
ostream_iterator<char> out(cout, " ");

cout << "chars from the last t to the beginning: ";
vector<char>::reverse_iterator r = find(vector1.rbegin(), vector1.rend(), "t"
);
copy(r, vector1.rend(), out); cout << endl;
cout << "chars from the last t to the end: ";
copy(r.base() - 1, vector1.end(), out); cout << endl;
return 0;
}</source>
<pre class=codeResult>chars from the last t to the beginning: t I
chars from the last t to the end: t i s h i m .</pre>

← Предыдущая	Версия 14:21, 25 мая 2010
(нет различий)

C++ Tutorial/string/string find - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...