我试图检查某个book_name是否在库中。
我已经定义了struct book和array库：
typedef struct Book
{
char name[NAME_LENGTH];
char author[AUTHOR_NAME_LENGTH];
char publisher[PUBLISHER_NAME_LENGTH];
char genre[GENRE_LENGTH];
int year;
int num_pages;
int copies;
} book;
book library[BOOK_NUM];
我正在尝试检查我作为输入收到的图书名称是否在库中：
int check_existance(char *input, book *library)
{
int i;
for (i=0; i < BOOK_NUM; i++) {
if (strcmp(library[i].name , input))
return TRUE;}
return FALSE;};
但收到以下错误：
错误C2081：＆＃39;预订＆＃39; ：正式参数列表中的名称非法
谢谢。
这是我的main.c文件：
#include <stdio.h>
#include "define_library.h"
#include "add_book.h"
int main()
{
int opt = 0;
printf("*********************************************\n"
"Welcome to BURLAND national library!\n"
"*********************************************\n"
"Library menu:\n"
"1. Add a book\n"
"2. Take a book\n"
"3. Return a book\n"
"4. Print all library books\n"
"5. Quit\n"
"Please choose the desired option [1-5]:\n");
scanf("%d", &opt);
while (opt < 1 || opt > 5)
{
printf("Invalid number was entered. Please choose again 1-3:\n");
scanf("%d", &opt);
}
switch (opt) {
case 1: printf("1 gever\n"); break;
case 2: printf("2 ahi\n"); break;
case 3: printf("3 kapara\n"); break;
case 4: printf("4 meleh\n"); break;
case 5: printf("5 nasich\n"); break;
default:
printf("We should not get here!\n");
}
return 0;
}
这是define_library.h：
#ifndef DEFINE_LIBRARY_H
#define DEFINE_LIBRARY_H
struct book;
struct library;
int check_existance(char, book);
#endif
这是define_library.c文件：
#include <stdio.h>
#include <string.h>
#define BOOK_NUM 50
#define NAME_LENGTH 200
#define AUTHOR_NAME_LENGTH 100
#define PUBLISHER_NAME_LENGTH 50
#define GENRE_LENGTH 50
#define TRUE 1
#define FALSE 0
typedef struct Book
{
char name[NAME_LENGTH];
char author[AUTHOR_NAME_LENGTH];
char publisher[PUBLISHER_NAME_LENGTH];
char genre[GENRE_LENGTH];
int year;
int num_pages;
int copies;
} book;
book library[BOOK_NUM];
int check_existance(char *input, book *library)
{
int i;
for (i=0; i < BOOK_NUM; i++) {
if (strcmp(library[i].name , input))
return TRUE;}
return FALSE;
};
答案 0 :(得分：-1)
以下是我认为您尝试做的最低限度的工作示例。基于上述评论需要注意的重点是：
编译：gcc main.c define_library.c
的main.c
#include <stdio.h>
#include <string.h>
#include "define_library.h"
book library[BOOK_NUM];
int main()
{
int opt = 0;
printf("*********************************************\n"
"Welcome to BURLAND national library!\n"
"*********************************************\n"
"Library menu:\n"
"1. Add a book\n"
"2. Take a book\n"
"3. Return a book\n"
"4. Print all library books\n"
"5. Quit\n"
"Please choose the desired option [1-5]:\n");
scanf("%d", &opt);
while (opt < 1 || opt > 5)
{
printf("Invalid number was entered. Please choose again 1-3:\n");
scanf("%d", &opt);
}
switch (opt) {
case 1: printf("1 gever\n"); break;
case 2: printf("2 ahi\n"); break;
case 3: printf("3 kapara\n"); break;
case 4: printf("4 meleh\n"); break;
case 5: printf("5 nasich\n"); break;
default:
printf("We should not get here!\n");
}
strcpy(library[2].name,"abc");
int book_present = check_existence("abc",library);
printf("book present: %d\n",book_present);
return 0;
}
define_library.h
#ifndef DEFINE_LIBRARY_H
#define DEFINE_LIBRARY_H
#define BOOK_NUM 50
#define NAME_LENGTH 200
#define AUTHOR_NAME_LENGTH 100
#define PUBLISHER_NAME_LENGTH 50
#define GENRE_LENGTH 50
#define TRUE 1
#define FALSE 0
typedef struct Book
{
char name[NAME_LENGTH];
char author[AUTHOR_NAME_LENGTH];
char publisher[PUBLISHER_NAME_LENGTH];
char genre[GENRE_LENGTH];
int year;
int num_pages;
int copies;
} book;
int check_existence(char *, book *);
#endif
define_library.c
#include <stdio.h>
#include <string.h>
#include "define_library.h"
int check_existence(char *input, book *library)
{
for (int i=0; i < BOOK_NUM; i++) {
if (strcmp(library[i].name , input))
return TRUE;
}
return FALSE;
};