程序清单4.1——课本60页，马铃薯分析程序

#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<<"The package with "<<yams[1]<<" yams costs ";
cout<<yamcosts[1]<<" cents per yam.\n";
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<<"\nSize of yams array = "<<sizeof yams;
cout<<" bytes.\n";
cout<<"Size of one element = "<<sizeof yams[0];
cout<<" bytes.\n";
system("pause");
return 0;
}