snake | 一款小巧的基于Go构建的开发框架，可以快速构建API服务或者Web网站进行业务开发，遵循SOLID设计原则 | REST library

The problem is that your prediction has an "incorrect" shape when you're trying to check for each of the values. The following illustrates this:

You should narrow References type instead of declaring it explicitly:

The following are all equivalent:

The simplest way would be when the brick moves and hits the wall it has each segment be set to invisible. These can all be cleaned up or removed at an intermediary screen like a play again/etc

You need to let dart know the type of questions[_questionIndex]['questionText']

Try this:

Change questions[_questionIndex]['questionText']

to questions[_questionIndex]['questionText'] as String

In the error line

Only properties that are common to all constructors will generate a copyWith method, as mentioned in the README docs.

From what you describe, what you want is:

1. open the file for writing
2. write to the file
3. be done with writing to the file
4. open the file for reading
5. read from the file
6. be done with reading form the file.

So your code should reflect that sequence!

The key point is that you are ever only reading or writing from the file at any given moment, so the ifstream and the ofstream should never exist at the same time!

There's a few ways to go about that, but the simplest is to use functions to isolate them. Here's what that would look like in your case:

Your programs have several bugs, I have fixed them. The most serious is that your code cannot be compiled in C++. If it's intended to build it under C++, you need to fix the compile errors at first.

1. newPiece = malloc(sizeof(struct snake));, need a convertion here: newPiece = (snake *)malloc(sizeof(struct snake));, generally it's not recomended to use malloc in c++, it's more naturally to use new

2. first = addNewPiece("#"); Pass string literal as char argument, need to pass a character here.

3. mvwprintw(win, y, x, t);, you have misunderstand the API, should be fixed as mvwprintw(win, y, x, "%c", t->piece);, you need to see the document before use a library API to see what types of arguments it expects

4. You forget to refresh the screen after printing the screen!

5. You haven't increment the index in for loop, it's an infinite loop.

Your code is somewhat c style, if you are trying to write with C++, it needs to be refactored, some suggestions:

• use std::vector to store the snake body, then we don't need to manage the memory by hand. And avoid the error-prone linked list processing. Then most part of your code can be simplified.
• Use a logging library and print logs to help to debug

The fixed code should work, I get a vertical snake on my console.