相关疑难解决方法(0)

在C和C++编程语言中,使用尖括号和在include语句中使用引号有什么区别,如下所示？

1. #include <filename>
2. #include "filename"

我有一个像这样的错误

    In file included from Level.hpp:12,
                 from main.cpp:4:
Corridor.hpp: In method `void Game::Corridor::update()':
Corridor.hpp:41: invalid use of undefined type `class Game::Level'
Corridor.hpp:13: forward declaration of `class Game::Level'
Corridor.hpp:42: invalid use of undefined type `class Game::Level'
Corridor.hpp:13: forward declaration of `class Game::Level'
Corridor.hpp:43: invalid use of undefined type `class Game::Level'
Corridor.hpp:13: forward declaration of `class Game::Level'
Corridor.hpp:44: invalid use of undefined type `class Game::Level'
Corridor.hpp:13: forward declaration of `class Game::Level'

走廊和水平......

  // Corridor.hpp

#ifndef GAME_CORRIDOR_HPP
#define GAME_CORRIDOR_HPP

#include <Moot/Math.hpp>

//#include <Level.hpp> …