C++题目问题

建立一个具有书名。册数。单价和金额成员的结构体book。要求从建盘输入5门教才的书名。册数。单价信息。自动求出每门教才的金额。并按册数降序升序输出5门教才的所有信息

帮你写了个. 你看看.

#include <iostream>
#include <string>
using namespace std;

const N=5;

struct book
{
string title;
unsigned int copies;
unsigned int unit_price;
unsigned int sum;
};

void set(book s[]);
void desc(book s[]);
void order(book s[]);
void print(book s[]);

void set(book s[])
{
for(int i=0;i<N;i++)
{
cout<<endl;
cout<<"输入书名:";
cin>>s[i].title;
cout<<"输入册数:";
cin>>s[i].copies;
cout<<"输入单价:";
cin>>s[i].unit_price;

s[i].sum = s[i].unit_price * s[i].copies;
}
}

void desc(book s[])
{
book t;
int k;
for(int i=0;i<N-1;i++)
{
for(int j=i+1;j<N;j++)
{
if(s[i].copies<s[j].copies)
{
t=s[i];
s[i]=s[j];
s[j]=t;
}
}

}
cout<<"\n按册数降序排列"<<endl;
print(s);
}

void order(book s[])
{
book t;
for(int i=0,j=N-1;i!=j;i++,j--)
{
t=s[i];
s[i]=s[j];
s[j]=t;
}
cout<<"\n按册数升序序排列"<<endl;
print(s);
}

void print(book s[])
{
cout<<"书名\t册数\t单价\t金额"<<endl;
for(int i=0;i<5;i++)
{
cout<<s[i].title<<'\t'<<s[i].copies<<'\t'
<<s[i].unit_price<<'\t'<<s[i].sum<<endl;
}
}

int main()
{
book a[5];
set(a);
desc(a);
order(a);
return 0;
}