c++数组

#include <iostream>using namespace std;int main() {int yams[3];yams[0] = 7;yams[1] = 8;yams[2] = 6;int yamcosts[3] = {20,30,5};cout << "Total yams =";cout << yams[0] + yams[1] + yams[2] <<endl;cout << yamcosts[1]<<endl;int total = yams[0] * yamcosts[0] +yams[1] * yamcosts[1];total = total + yams[2] * yamcosts[2];cout << "The total yam expense is "<<total<< " cents./n";cout << " Size of yams array = " << sizeof yams <<" bytes./n";cout << " Size of one element = " << sizeof yams[0]<<" bytes./n";cout << " the length of yams array is " << (sizeof yams) / (sizeof yams[0])<<endl;cout << " the length of yams array is " << (sizeof yams) / (sizeof *yams)<<endl;cout << " the length of yams array is " << (sizeof yams) / (sizeof(int))<<endl;double test[3] = {12.2,13.5,14.0};cout << " the length of test array is " << (sizeof test)/(sizeof test[0])<<endl;cout << " the length of test array is " << (sizeof test)/(sizeof *test)<<endl;cout << "test : " << test <<endl;//数组名放在sizeof后面可以代表整个数据从而求出数组所占空间cout << "test = " << *test <<endl;//但实际上它做为指针是指向数组中的第一个元素cout << "test + 1 : " << (test + 1) << endl;//数组名加1指针会得到下一个数组的地址cout << "test + 1 = " << *(test + 1) << endl;// int cards[4] = {1,2,3,4};//合法// int hand[4];//合法// hand = {3,4,5,6}//不合法// hand = cards;//不合法指针间不允许这样做// return 0;}