Check how many characters are stored in ostrstream : ostrstream « File Stream « C++ Tutorial

1. C++ Tutorial
2. File Stream
3. ostrstream

#include <strstream>    
#include <iostream>   
using namespace std;
main()   
{   
  char str[80];   
     
  ostrstream outs(str, sizeof(str));   
     
  outs << "Hello ";   
  outs << 34 << " " << 1234.23;   
  outs << ends;  
     
  cout << outs.pcount(); // display how many chars in outs   
     
  cout << " " << str;   
     
  return 0;   
}