C++中地递增递减运算符和指针

//自增和自减指针
	double arr[5] = { 21.1,32.8,45.6,58.6,58.6 };
	double* pt = arr;
	++pt;
	cout << "data is:" << *pt << endl;
	double x = *++pt;//increment the pointer,take the value
	++* pt;//increment the pointer to the value
 
	(*pt)++;//increment pointed-to value
	x = *pt++;//dereference original location,the increment pointer