C++Primer4.35練習題。

很簡單的一斷代碼，但是被迷惑了。

int main()
{
	char cval;
	cval = 'a' + 3;
	cout << cval << endl;
	system("pause");
	return 0;
}
           

你若不生死相依，我必離你而去。

#include <iostream>
using namespace std;

int main()
{
        char cval;
        cval = 'a' + 3;
        cout << cval << endl;
        int i ;
        double d;
        const string *ps;
        char *pc;
        void *pv;
        pv = const_cast<string*>(ps);
        cout<<"const_cast<string*>(ps)"<<pv<<endl;
        pv = (void*)ps;
        cout<<"pv=(void*)ps"<<pv<<endl;

        i = static_cast<int>(*pc);
        cout<<"static_cast<int>(*pc)"<<i<<endl;
        i = int(*pc);
        cout<<"int(*pc)"<<i<<endl;



        pv = reinterpret_cast<double*>(&d);
        cout<<"reinterpret_cast<double*>(&d)"<<pv<<endl; 
        pv=&d;
        cout<<"pv=&d"<<pv<<endl;                        


        pc = static_cast<char*>(pv);
        cout<<"static_cast<char*>(pv)"<<pc<<endl;
        pc = (char*)pv;
        cout<<"pc=(char*)pv"<<pc<<endl;
        return 0;
}
           

至今未看懂，至今沒看會，我脖子疼，睡覺~~~