Question

我正在为一个可以插入一本书的图书馆制作一个程序，显示插入的所有书籍，并根据用户插入的book_code搜索一个特定的书名，我已经做了2个但是最后一个一个（搜索）不会像我预期的那样运行..如果有人在这里可以帮助我，我会非常感激。继承人的代码

#include <iostream>
#include <conio.h>
void show_book(const Book &book );
void input_book (Book &book);
int main ()
{
  Book book[10];
  int i,x;
  char search;
  int position,found;
  cout<<"How many book you want to add = "; cin>>x;
  for (i=0; i<x; i++){
    input_book(book[i]);
  }
  for(i=0; i<x; i++){
    show_book(book[i]);
  }
//this is my searching code , im stuck here .. 
  cout<<"\n====== SEARCH ====="<<endl;
  cout <<"Enter book code = "; cin>>search;
  for (i=0; i<x; i++){
  if(book->book_code[i] == search){
    found = 1;
    position = i;
    i = x;
  }
}
  if (found != 0){
    show_book(book[position]);
  } else{
cout<<"The book is not exist";
 }
  return 0;
}
//function declaration...
void show_book(const Book &book){
  cout<<book.book_code<<" | "<<book.book_title<<endl;
}
void input_book(Book &book){
      cout << "Book code : ";cin  >> book.book_code;
      cin.ignore(1, '\n');
      cout << "Book title : " ;getline(cin, book.book_title);
}

this is the output now look like

Answer 1

你应该改变

ng-model

到

if(book->book_code[i] == search) // accesses 1-st book, namely book[0]

如果您可以使用if(book[i].book_code == search) // accesses i-th book而不是std::array，则可以写得更好：

Book book[10];

在Frank的评论中指出，对于std::array<Book, 10> book;，你应该使用与search相同的类型。

此外，最好将book_code用于bool变量：

found

Answer 2

found在搜索块开始时未初始化为0.

修订后的代码如下

for (i=0,found=0;i<x && !found; ++i)
  if (book[i].book_code == search)
  {
    found = 1;
    position = i;
  }

在c ++上搜索struct内部的对象

2 个答案: