VC++异常捕获？？

#include <string>
#include<iostream> // for cerr
//#include <stdexcept> // for what ?
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
string s1("UIPower");
char chA = s1[2];

try
{
char chD = s1.at(300);
}
catch(...)
{
printf("err\n");
}

printf("\n");
try
{
char chD = s1.at(300);
}
catch(std::out_of_range &ex)
{
std::cerr << ex.what() << " Line:" << __LINE__ << " File:" << __FILE__ << endl;
}

printf("\n");
try
{
char chD = s1.at(300);
}
catch(std::exception &ex)
{
std::cerr << ex.what() << " Line:" << __LINE__ << " File:" << __FILE__ << endl;
}

system("pause");
return 0;
}