输出函数有问题吗 求解

Question

#include "ds.h"//自定义的头文件
using namespace std;//c++中指定命名空间
 
struct Book    //定义一种结构体类型
{
    int ISBN;         //书号
    char  name[20];        //书名
    char   author[20];       //作者
    char   publisher[20];   //出版单位
    float  price;//价格
    int  year;//图书的年【若为1988年出版  请输入1988】
    int month;//图书的月【输入方法同上】
    int day; //图书的日【输入方法同上】               //中间请用空格空开
};
Book book[MAXSIZE];
 //9787521334111 新未来大学英语综合教程 孙有中 外语教学与研究出版社 74.9 2022 7 1
void input(int &num)
{
    int i;
    cout<<"输入图书的本数num=";
    cin>>num;
    cout<<"请输入"<<num<<"本图书的信息,空格分开\n";
    for(i=0; i<num; i++)
    {
        cin >> book[i].ISBN >> book[i].name >> book[i].author >> book[i].publisher >> book[i].price >> book[i].year >> book[i].month >> book[i].day;
    }
    for(i=0; i<num; i++)
    {
        cout << book[i].ISBN << book[i].name << book[i].author << book[i].publisher << book[i].price << book[i].year << book[i].month << book[i].day << endl;
    }
}
void output(int num)
{
    int i;
    for (i=0; i<num; i++)
    {
        cout<<"书名："<<book[i].name<<" 作者；"<<book[i].author<<" 出版单位："<<book[i].publisher<<" 价格："<<book[i].price<<" 出版日期："<< book[i].year << " " << book[i].month << " " << book[i].day << " "<< endl;
    }
    cout<<"\n";
}
 
void insertm(int& num)   //在最后面依次添加num本图书
{
    int i,m;
    cout << "需要添加图书信息的本数为：\n ";
    cin >> m;
    cout << "请输入其信息【依次为书号（ISBN) 书名 作者 出版单位 价格 出版日期（书号不重复，用空格空开】\n ";
    for (i=0; i<m; i++)
    {
        cin >> book[i].ISBN >> book[i].name >> book[i].author >> book[i].publisher >> book[i].price >> book[i].year >> book[i].month >> book[i].day;
    }
    num = num + m;
    cout << "图书信息添加后为：\n";
    output(num);
}
 
void delete_books(int num)
{
    int i,choice,ISBN1,t=0;
    char name1[1];
    cout<<"进入删除图书系统\n";
    cout<<"按书号删除请按1\n";
    cout<<"按书名删除请按2\n";
    cin>>choice;
    switch(choice)
    {
    case 1:
        cout<<"请输入你想删除的图书的书号： ";
        cin>>ISBN1;
        for(i=0; i<num; i++)
        {
            if(ISBN1 == book[i].ISBN)
            {
                t = i; //记住要删除图书的下标
                break;
            }
            else
                cout<<"删除失败，请确认书号是否正确！"<<endl;
        }
        if(t != num - 1) //判断要删除图书是否为最后一本 即判断t是否为最后一个值
        {
            for(i=t; i<num; i++)
            {
                book[i] = book[i+1];
            }
        }
        num = num-1;
    case 2:
        cout<<"请输入你想删除的图书的书名： ";
        cin>>name1;
        for(i=0; i<num; i++)
        {
            if(name1 == book[i].name)
            {
                t = i; //记住要删除图书的下标
                break;
            }
            else
                cout<<"删除失败，请确认书名是否正确！"<<endl;
        }
        if(t != num-1) //判断要删除图书是否为最后一本 即判断t是否为最后一个值
        {
            for(i=t; i<num; i++)
            {
                book[i] = book[i+1];
            }
        }
        num = num-1;
    }
}
 
void change_books(int num)
{
    int ISBN2;
    int i,t=0,choice;
    cout<<"请输入要修改信息图书的书号："<<endl;
    cin>>ISBN2;
    for(i=0; i<num; i++)
    {
        if(ISBN2 == book[i].ISBN)
        {
            t = i;
            break;
        }
        else
            cout<<"无图书信息，请确认书号是否正确！"<<endl;
    }
    cout<<"请输入需要修改信息的序号:"<<endl;
    cout<<"1.书名"<<endl;
    cout<<"2.作者"<<endl;
    cout<<"3.出版单位"<<endl;
    cout<<"4.价格"<<endl;
    cin>>choice;
    switch(choice)
    {
    case 1:
        cout<<"请输入：";
        cin>>book[t].name;
        break;
    case 2:
        cout<<"请输入：";
        cin>>book[t].author;
        break;
    case 3:
        cout<<"请输入：";
        cin>>book[t].publisher;
        break;
    case 4:
        cout<<"请输入：";
        cin>>book[t].price;
        break;
    default:
        cout<<"输入错误！请重新输入1-4"<<endl;
    }
}
 
void book_search(int num)
{
    int i,choice,ISBN3;
    char name3[100];
    cout<<"进入查询图书系统\n";
    cout<<"按书号查询请按1\n";
    cout<<"按书名查询请按2\n";
    cin>>choice;
    switch(choice)
    {
    case 1:
        cout<<"请输入你想查询的图书的书号：";
        cin>>ISBN3;
        for(i=0; i<num; i++)
        {
            if(ISBN3 == book[i].ISBN)
            {
                cout<<"查询成功\n";
                cout<<"该书基本信息为：\n";
                cout<<"书名："<<book[i].name<<" 作者；"<<book[i].author<<" 出版单位："<<book[i].publisher<<" 价格："<<book[i].price<<" 出版日期 年："<< book[i].year << " " << "出版日期 月" << book[i].month << " " << "出版日期 日" << book[i].day << " "<< endl;
                break;
            }
        }
        cout<<"查询失败，请核对书号是否正确\n";
    case 2:
        cout<<"请输入你想查询的图书的书名：";
        cin>>name3;
        for(i=0; i<num; i++)
        {
            if(strcmp(name3,book[i].name))
            {
                cout<<"查询成功\n";
                cout<<"该书基本信息为：\n";
                cout<<"书名："<<book[i].name<<" 作者；"<<book[i].author<<" 出版单位："<<book[i].publisher<<" 价格："<<book[i].price<<" 出版日期 年："<< book[i].year << " " << "出版日期 月" << book[i].month << " " << "出版日期 日" << book[i].day << " "<< endl;
                break;
            }
        }
        cout<<"查询失败，请核对书名是否正确\n";
    }
}
 
int main()
{
    int num=0;
    int choice;
    /*cout << "请输入你想进行图书信息管理的图书本数：\n";
    cin >> num;
    cout << "请输入" << num << "本图书信息 【书号（ISBN) 书名 作者 出版单位 价格 出版日期（书号不重复），用空格空开】: \n";   //完成图书信息输入
    for (i = 0; i < book1.num; i++)
    {
    cin >> book.ISBN >> book.BookName[i] >> book.author[i] >> book.publisher[i] >> book.price[i] >> book.data[i] ;   //字符数组进行整体输入
    }*/
    input(num);
    cout << "进行图书信息浏览：    " << endl;
    output(num);
    cout<<"请输入需要进入的系统1-4";
    cin>>choice;
    switch(choice)
    {
    case 1:
        insertm(num);
        break;
    case 2:
        delete_books(num);
        break;
    case 3:
        change_books(num);
        break;
    case 4:
        book_search(num);
        break;
    }
    system("pause");
}

Answer 1

姓名和出版社字符串太长了，超过20字节啦