我的代码：
类“表”中有一个数组来保存新添加的书（结构）；
只需在数组中的一个旁边添加一个；
search 可以使用 ISBN、title 或 author，这些都是 book (struct) 中的变量；
打印应该是计算书的信息
问题：print不能打印字符串（书中的变量都是字符串）
可能不是问题：插入，添加......这种功能应该很好用，因为当我搜索某本书时，它显示“找到书”
#include<iostream>
#include<string>
using namespace std;
struct book
{
string isbn;
string title;
string author;
string date;
};
class table
{
public:
//member constant
static const size_t CAPACITY = 30;
//constructor
table() {used = 0;}
//modification
bool insert(book entry);
//constant
size_t hash_isbn(string target_isbn);
size_t hash_title(string target_title);
size_t hash_author(string target_author);
size_t search_isbn(string target_isbn);
size_t search_title(string target_title);
size_t search_author(string target_author);
void print(size_t index);
private:
//member variables
book data[CAPACITY];
size_t used;
};
//modification member functions
bool table::insert(book entry)
{
if(search_isbn(entry.isbn))
return false;
data[used] = entry;
used++;
return true;
}
//constant member functions
size_t table::hash_isbn(string target_isbn)
{
size_t index = 0;
bool found = false;
while((index < used) && (!found))
{
if(data[index].isbn == target_isbn)
{
found = true;
continue;
}
index ++;
}
if(!found)
index = -1;
return index;
}
size_t table::hash_title(string target_title)
{
size_t index = 0;
bool found = false;
while((index < used) && !found)
{
if(data[index].title == target_title)
{
found = true;
continue;
}
index ++;
}
if(index == used)
index = -1;
return index;
}
size_t table::hash_author(string target_author)
{
size_t index = 0;
bool found = false;
while((index < used) && !found)
{
if(data[index].author == target_author)
{
found = true;
continue;
}
index ++;
}
if(index == used)
index = -1;
return index;
}
size_t table::search_isbn(string target_isbn)
{
return hash_isbn(target_isbn)+1;
}
size_t table::search_title(string target_title)
{
return hash_isbn(target_title)+1;
}
size_t table::search_author(string target_author)
{
return hash_isbn(target_author)+1;
}
void table::print(size_t index)
{
cout.flush();
cout<<data[index].title<<endl;
cout<<"Title: "<<data[index].title<<endl;
cout<<"ISBN: "<<data[index].isbn<<endl;
cout<<"Author: "<<data[index].author<<endl;
cout<<"Publication data: "<<data[index].date<<endl;
cout<<endl;
}
//nonmember functions
void add(table t)
{
book entry;
cout<<"Enter author name:"<<endl;
cin>>entry.author;
cout<<endl;
cout<<"Enter book name:"<<endl;
cin>>entry.title;
cout<<endl;
cout<<"Enter ISBN:"<<endl;
cin>>entry.isbn;
cout<<endl;
cout<<"Enter the publication data:"<<endl;
cin>>entry.date;
cout<<endl;
if(t.search_isbn(entry.isbn))
cout<<"==== The book already exists !!! ==="<<endl;///////////////////////输入重复时，此处并未执行
else
t.insert(entry);
}
void search(table t)
{
string option;
cout<<"Seach by ISBN (I), book title (T), or author (A). Choice: ";
cin>>option;
cout<<endl;
while((option != "I") && (option != "T") && (option != "A"))
{
cout<<"Not an accessible option, try again:"<<endl
<<"Seach by ISBN (I), book title (T), or author (A). Choice: ";
cin>>option;
cout<<endl;
}
size_t index;
if(option == "I")
{
string target_isbn;
cout<<"Enter ISBN: ";
cin>>target_isbn;
cout<<endl;
index = t.search_isbn(target_isbn);
}
if(option == "T")
{
string target_title;
cout<<"Enter Title: ";
cin>>target_title;
cout<<endl;
index = t.search_isbn(target_title);
}
if(option == "A")
{
string target_author;
cout<<"Enter Author: ";
cin>>target_author;
cout<<endl;
index = t.search_isbn(target_author);
}
if(index+1)
{
cout<<"Book found"<<endl;
t.print(index);
}
else
cout<<"==== The book does not exist !!! ==="<<endl;
}
int main()
{
table hash_table;
string action;
bool done = false;
while(!done)
{
cout<<"Add a new book (A), search (S), or end program (E)? ";
cin>>action;
cout<<endl;
while((action != "A") && (action != "S") && (action != "E"))
{
cout<<"Not an accessible option, try again:"<<endl
<<"Add a new book (A), search (S), or end program (E)? ";
cin>>action;
cout<<endl;
}
if(action == "A")
add(hash_table);
if(action == "S")
search(hash_table);
if(action == "E")
{
done = true;
continue;
}
}
hash_table.print(0); // this code just try to test my problem in a simple way
system("pause");
return 0;
}