你好！请教下面
struct date
{
int year;
int month;
int day;
};
struct book
{
char name[20];
int ID;
int price;
    date publicdate;
};

void add(book a[20],int &num);
void sum(book a[20],const int &sum);
void mostexpensive(book a[20],const int &num);
void putdown(book a[20],int &num);
void exit ();

#include <iostream>
using namespace std;
int main ()
{
bool flag = 1;
while ( flag )
{
int choice;

book basket[20];
int n = 0;

cout << "选择一下功能\\n1.添加一本书.\\n2.放下一本书.\\n3.查询最贵的书.\\n4.查询当前书篮中书的总价.\\n5.退出\\n";
do
{
cin >> choice;
}
while (choice < 1 || choice > 5);
switch ( choice )
{
case 1:add(basket,n); break;
case 2:putdown(basket,n); break;
case 3:mostexpensive(basket,n); break;
case 4:sum(basket,n); break;
case 5:flag = 0; break;
default:cout << "error!!!!";
}
}
return 0;
}

void add(book a[20],int &num)
{
cout << "输入书的名字，ID，价格，出版日期。\\n";
cin >> a[num].name >> a[num].ID >> a[num].price >> a[num].publicdate.year >> a[num].publicdate.month >> a[num].publicdate.day;
num ++;
}

void putdown(book a[20],int &num)
{
char bookname[20];
bool flag = false;
int i,j,k;

cout << "输入书的名字\\n";
cin >> bookname;

for (i=0;i<num&&(!flag);i++)
{
for (k=0;k<20;k++)  
{
if (bookname[k] == a[i].name[k]) //if (strcmp(bookname , a[i].name ) == 0)
{
flag = true;

}
else {flag = false;
break;}
}
}
if (flag)
{
for ( j = i; j < 20; j-- )
a[j] = a [j+1];
num --;
}
else
cout << "您并没有选择过该书！\\n";
}

void mostexpensive(book a[20],const int &num)
{
int i;
int max,m;
cout << "查询出最贵的书。\\n";
max = a[0].price;

for ( i = 1; i < num; i++)
{
if (a[i].price > max)
{
m = i;
max = a[i].price;
}
}
cout << "名字:" << a[m].name << "ID:" << a[m].ID << "价格:" << a[m].price
<< "出版日期:" << a[m].publicdate.year << "-" << a[m].publicdate.month
<< "-" << a[m].publicdate.day;

}

void sum(book a[20],const int &num)
{
int i;
int booksum = 0;
for ( i= 0; i < num; i++)
{
booksum = booksum + a[i].price;
}
cout << booksum;
}
怎么运行的有问题

为什么不用指针？为什么不建立链表？简单的事情被你弄的效率低，占用空间又大！

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