Question

#include <stdio.h>
#define MAX_TITLE_SIZE 20
#define MAX_BOOKS 10

struct Book{
  int _isbn;
  float _price;
  int _year;
  char _title[MAX_TITLE_SIZE];
  int _qty;
};

void displayInventory(const struct Book book[], const int size){

  int i;

  printf("===================================================\n");
  printf("ISBN      Title              Year Price  Quantity\n");
  printf("---------+------------------+----+-------+--------\n");

  //iterate through objects
  if(size == 0){
    printf("The inventory is empty!\n");
    printf("===================================================");
  }
  else{
    for(i = 0; i < size; i++){
      printf("%-10.0d%-18s%5d $%-8.2f%-8d\n", book[i]._isbn, book[i]._title, book[i]._year, book[i]._price, book[i]._qty);
    }
  }
}

void addBook(struct Book book[], int *size){

  if(*size == MAX_BOOKS){
    printf("the inventory is full\n");
  }
  else{

     //increment inventory size
    (*size)++;  //*size will move the pointer to the next in position/hashcode
    //++*size also works



    printf("ISBN:");
    scanf("%d", book[*size]._isbn);
    printf("Title:");
    scanf("%s", book[*size]._title);
    printf("Year:");
    scanf("%d", book[*size]._year);
    printf("Price:");
    scanf("%f", book[*size]._price);
    printf("Quantity:");
    scanf("%d", book[*size]._qty);

    printf("The book is sucessfully added to the inventory.\n");
    printf("\n");
  }
}

int main(void){

  int size = 0;
  struct Book book[MAX_BOOKS];

  book[0]._isbn = 1234;
  printf("Create string: ");
  scanf("%s", book[0]._title);
  book[0]._year = 1992;
  book[0]._price = 192.90;
  book[0]._qty = 2;

  size++;

  addBook(book, &size);

  displayInventory(book, size);
  return 0;
}

所以我有这个簿记系统，我试图制作，我想要做的是在book []数组结构中添加一本新书。

当我尝试在addBook（）函数中输入书籍的ISBN时，整个应用程序以非零状态结束。

如何从函数写入数据结构？对不起，如果这是一个愚蠢的问题，但我已经坚持了一段时间。

我做错了什么？

这是指向repl.it的链接：https://repl.it/JRPH/4

Answer 1

使用address时，您应该参考scanf变量。具体而言，scanf("%d", book[*size]._isbn); - ＆gt; scanf("%d", &(book[*size]._isbn));等等......

看看this。

如何从C中的函数内部将变量扫描到数据结构中

1 个答案: