в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:25:50Z

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==Access the contents of a string using iterators==

<source lang="cpp">
#include <string>
#include <iostream>
int main(){
using namespace std;
string str ("Hello String");
int i = 0;
string::const_iterator itt;
for ( itt = str.begin (); itt != str.end (); ++ itt )
{
cout << "Character [" << i ++ << "] is: ";
cout << *itt << endl;
}
//The char* representation of the string is: "
cout << str.c_str () << endl;
return 0;
}

</source>

==Create an iterator to a string and Use it to cycle through the characters of a string==

<source lang="cpp">
#include <iostream>
#include <string>
#include <cctype>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
string strA("This is a test.");
string::iterator itr;

for(itr = strA.begin(); itr != strA.end(); ++itr)
cout << *itr;
return 0;
}

</source>

==increment the iterator==

<source lang="cpp">
#include <iostream>
#include <string>
#include <cctype>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
string strA("This is a test.");
string::iterator itr;
itr = find(strA.begin(), strA.end(), "a");
++itr;
return 0;
}

</source>

==string::npos==

<source lang="cpp">

#include <iostream>
#include <string>
using std::cout;
using std::endl;
using std::string;
int main() {
string text = "asdf asdf asdf asdf asdf";
size_t start = text.find_first_not_of("df");

cout << start;
cout << string::npos;
return 0;
}
/*
04294967295
*/

</source>

==use iterator==

<source lang="cpp">

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main()
{
string str1("Strings handling is easy in C++");
string::iterator p;
unsigned int i;
// use iterator
p = str1.begin();
while(p != str1.end())
cout << *p++;
cout << endl;

return 0;
}
/*
Strings handling is easy in C++
*/

</source>

==Using an iterator to output a string==

<source lang="cpp">

#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "Testing iterators" );
string::const_iterator iterator1 = string1.begin();
cout << "string1 = " << string1
<< "\n(Using iterator iterator1) string1 is: ";
while ( iterator1 != string1.end() )
{
cout << *iterator1;
iterator1++;
}
cout << endl;
return 0;
}
/*
string1 = Testing iterators
(Using iterator iterator1) string1 is: Testing iterators
*/

</source>

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