static_cast _type_expression的小问题

#include <iostream>
#include <iomanip>

using std::cout;
using std::cin;
using std::endl;
//using std::setw;

int main()
{
 char cEnd;
 char ch;
 double dh;
 cout << "Please input any key to set ch; " <<endl;
 cin >> ch;

 dh = static_cast<double>(ch);

 cout << "dh = static_cast<int>(ch);" << endl;
 cout << "dh = " << dh <<endl;

 //for endl;
 cout << "Please input any key to endl;" <<endl;
 cin >> cEnd;
 cout << cEnd << endl;

 return 0;
}