결과를 예측해 보세요.

#include <iostream>
#include <string>
 
using namespace std;
 
string foo1() { string s = "hello"; return s; }
string foo2() { string s = " world"; return s; }
 
int main()
{
  const char* p1 = foo1().c_str();
  const char* p2 = foo2().c_str();
  cout << p1 << p2 << endl;
  return 0;
}