Question

请问VC++6.0里面 find函数，replace函数的用法！请举点简单的实例~

RT~
谢谢了！

Answer 1

// string::find
#include <iostream>
#include <string>
using namespace std;

int main ()
{
string str ("There are two needles in this haystack with needles.");
string str2 ("needle");
size_t found;

// different member versions of find in the same order as above:
found=str.find(str2);
if (found!=string::npos)
cout << "first 'needle' found at: " << int(found) << endl;

found=str.find("needles are small",found+1,6);
if (found!=string::npos)
cout << "second 'needle' found at: " << int(found) << endl;

found=str.find("haystack");
if (found!=string::npos)
cout << "'haystack' also found at: " << int(found) << endl;

found=str.find('.');
if (found!=string::npos)
cout << "Period found at: " << int(found) << endl;

// let's replace the first needle:
str.replace(str.find(str2),str2.length(),"preposition");
cout << str << endl;

return 0;
}

// replacing in a string
#include <iostream>
#include <string>
using namespace std;

int main ()
{
string base="this is a test string.";
string str2="n example";
string str3="sample phrase";
string str4="useful.";

// function versions used in the same order as described above:

// Using positions: 0123456789*123456789*12345
string str=base; // "this is a test string."
str.replace(9,5,str2); // "this is an example string."
str.replace(19,6,str3,7,6); // "this is an example phrase."
str.replace(8,10,"just all",6); // "this is just a phrase."
str.replace(8,6,"a short"); // "this is a short phrase."
str.replace(22,1,3,'!'); // "this is a short phrase!!!"

// Using iterators: 0123456789*123456789*
string::iterator it = str.begin(); // ^
str.replace(it,str.end()-3,str3); // "sample phrase!!!"
str.replace(it,it+6,"replace it",7); // "replace phrase!!!"
it+=8; // ^
str.replace(it,it+6,"is cool"); // "replace is cool!!!"
str.replace(it+4,str.end()-4,4,'o'); // "replace is cooool!!!"
it+=3; // ^
str.replace(it,str.end(),str4.begin(),str4.end());
// "replace is useful."
cout << str << endl;
return 0;
}

Answer 2

额