Question

void returning()
{
    char returned_date[50];
    int i;
    char returned_name[50];
    char returned_author[50];
    printf("Please enter the name of the book being returned and its author ");
    scanf("%49s %49s",returned_name, returned_author);
    do
    {
        if((strcmp(lib_books[i].name,returned_name)!=0)&&(strcmp(lib_books[i].author,returned_author)!=0))
        {
            i++;
            printf("Unfortunately, there is no book by this name, Search again");
        }
        else
        {
            if(strcmp(lib_books[i].status,"returned")!=0)
            {
                strcpy(lib_books[i].status,"returned");
                printf("Please enter the date returned");
                scanf("%s",returned_date[50]);
                if( returned_date== lib_books[i].returned)
                {
                    printf("The book was returned on time");
                    strcpy(lib_books[i].returned, "0");
                    strcpy(lib_books[i].borrowed,"0");
                    lib_books[i].amt_days=0;

                }
                else
                {
                    prices(i);
                    strcpy(lib_books[i].returned, "0");
                    strcpy(lib_books[i].borrowed,"0");
                    lib_books[i].amt_days=0;
                }

                printf("You have succesfully changed the status of a book!");
            }
            else
            {
                printf("This book has already been returned");
            }
        }       
    }while(strcmp(lib_books[i].status,"returned")!=0);
    menu();
}

请参阅随附的屏幕截图，了解我的体验。它将在接下来的30分钟内到期。我是新手，不习惯这样做，请你帮我找到问题！ After I enter the name of the book and the author this occurs:

Answer 1

以下情况需要改变：

while(strcmp(lib_books[i].status,"returned")!=0);

如果lib_books中的所有图书的状态均为"returned"，则会进入无限循环。请更新此条件以检查i是否已达到lib_books中的最大元素。这应该至少解决你的无限循环和打印问题。

我该如何解决

1 个答案: