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// swapping stringstream objects
#include <string>       // std::string
#include <iostream>     // std::cout
#include <sstream>      // std::stringstream
 
int main () {
 
  std::stringstream foo;
  std::stringstream bar;
 
  foo << 100;
  bar << 200;
 
  foo.swap(bar);
 
  int val;
 
  foo >> val; std::cout << "foo: " << val << '\n';
  bar >> val; std::cout << "bar: " << val << '\n';
 
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:13:3: error: expected ‘;’ before ‘int’
   int val;
   ^
prog.cpp:15:3: error: ‘foo’ was not declared in this scope
   foo >> val; std::cout << "ss val: " << val << '\n';
   ^
prog.cpp:15:10: error: ‘val’ was not declared in this scope
   foo >> val; std::cout << "ss val: " << val << '\n';
          ^

Standard output is empty