stringstream::str( empty string): Empty the string : stringstream « File Stream « C++ Tutorial

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2. File Stream
3. stringstream

#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>

using namespace std;

int main( ) {
  stringstream ss;
  ss << "string " << 9 << 1.2;

  cout << ss.str( ) << endl;
  ss.str("");                  // Empty the string
  cout << ss.str( ) << endl;
}

string 91.2