#include <iostream.h>
void main()
{
	const double * dp;
	double dVal1 = 123.456;
	double dVal2 =234.234;
	dp = &dVal1;
	//*dp = 789.012;   //錯誤，該地址的值不能改變
	dp =&dVal2;     //正確，對指針重新賦值
	cout << *dp << endl;
}