String streams

stringstreams are streams that are attached to a string rather than a file and letting you use the same syntax as file I/O. They are defined in <sstream>.

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#include <iostream>
#include <string>
#include <sstream>
using namespace std;

int main()
{
int i = 7;
string s1 = "He is ";
string s2 = " years old";

ostringstream ostring;
ostring << s1 << i << s2;

cout << "ostring =" << ostring.str() << endl;

return 0;
}