About the comment and exception(异常), which is not correct___________ A The compiler will ignore the comments, and it doesn't affect the length of executable file In c++ programming, "/*...*/" can be used for a paragraph of comments, "//" can be used for one line comments The compiler will detect the exception using “try{…}catch(*){…}” try{throw;}catch(*){…}re-throw(重抛) the exception;

The statement "try{throw;}catch(*){…}re-throw(重抛) the exception;" is not correct. It should be "try{throw;}catch(exceptionType){…}re-throw(重抛) the exception;" where "exceptionType" is the type of exception being thrown. The catch block should specify the type of exception being caught, not use a wildcard (*).

相关问题

carla安装cmake error cmake_c_compiler not set

在安装Carla时，如果出现CMake Error: CMAKE_C_COMPILER not set 或 CMake Error: CMAKE_CXX_COMPILER not set 的错误，可能是由于缺少C和C++编译器的配置导致的。解决这个问题的方法是设置正确的编译器路径。

以下是解决该问题的步骤：

1. 确保已经安装了C和C++编译器。在Linux系统上，可以通过以下命令安装：

sudo apt-get install build-essential

在Windows系统上，可以通过安装MinGW或Visual Studio来获取C和C++编译器。

2. 打开终端或命令提示符，并导航到Carla的安装目录。

3. 创建一个名为"build"的文件夹，并进入该文件夹：

mkdir build
cd build

4. 在build文件夹中运行以下命令来配置Carla的编译环境：

cmake ..

5. 如果出现CMake Error: CMAKE_C_COMPILER not set 或 CMake Error: CMAKE_CXX_COMPILER not set 的错误，可以通过设置编译器路径来解决。假设你的C编译器路径为"/usr/bin/gcc"，C++编译器路径为"/usr/bin/g++"，可以使用以下命令进行设置：

cmake -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/g++ ..

6. 重新运行cmake命令，确保没有出现错误。

7. 最后，使用make命令编译Carla：

make

完成上述步骤后，Carla应该能够成功编译和安装。

'_snprintf': is not a member of 'std'

`_snprintf` is not a member of the `std` namespace. It is a function that is specific to Microsoft's compiler and is used for safe string formatting. If you are encountering this error, it means that you are trying to use `_snprintf` in a context where it is not available.

If you are using a different compiler or platform, you can consider using the standard `snprintf` function instead, which should be available in the `stdio.h` header file. `snprintf` provides similar functionality to `_snprintf` and is portable across different platforms.

Here's an example of how you can use `snprintf`:

#include <stdio.h>

int main() {
    char buffer[100];
    int n = 42;
    snprintf(buffer, sizeof(buffer), "The number is: %d", n);
    printf("%s\n", buffer);
    return 0;
}

This code will format the number `42` into the `buffer` array using `snprintf` and then print it using `printf`.