CL 未知错误

Question

我在 VSC 中用 C++ 编写了一个简单的代码，当我编译它时 cl 给了我一些错误，即使它编译得很好。代码是：

#include <iostream>


int main()
{   
    //  Print welcome messages to the terminal
    std::cout << "You are a secret agent breaking into a secure server room\n";
    std::cout << "You need to enter the correct codes to continue..." << std::endl;

    //Declare 3 number code
    const int CodeA = 4;
    const int CodeB = 3;
    const int CodeC = 2;

    
    const int CodeSum = CodeA + CodeB + CodeC;
    const int CodeProduct = CodeA * CodeB * CodeC;

    // Print sum and product to the terminal
    std::cout << std::endl;
    std::cout << "+ There are 3 numbers in the code" << std::endl;
    std::cout << "+ The codes add-up to: " << CodeSum << std::endl;
    std::cout << "+ The code multiply to give: " << CodeProduct << std::endl << std::endl;

    int GuessA, GuessB, GuessC;
    std::cin >> GuessA;
    std::cin >> GuessB;
    std::cin >> GuessC;
    std::cout << "You entered: " << GuessA << GuessB << GuessC << std::endl;

    return 0;
}

我收到的错误消息是：

C:\Program Files (x86)\Microsoft Visual Studio19\Community\VC\Tools\MSVC.29.30037\include\ostream(284)：警告 C4530：使用了 C++ 异常处理程序，但未启用展开语义。指定 /EHsc

C:\Program Files (x86)\Microsoft Visual Studio19\Community\VC\Tools\MSVC.29.30037\include\ostream(269): 注意：编译时class模板成员函数'std::basic_ostream<char,std::char_traits> &std::basic_ostream<char,std::char_traits>::operator <<(int)'

triplex.cpp(22): 注意：参见函数模板实例化参考 'std::basic_ostream<char,std::char_traits> &std::basic_ostream<char,std::char_traits>::operator <<(int)' 正在编译

triplex.cpp(7)：注意：请参阅参考 class 模板实例化 'std::basic_ostream<char,std::char_traits>' 正在编译

谁能给我解释一下这些是什么？提前致谢！

Answer 1

这只是警告，它准确地告诉您：exception handler used, but unwind semantics are not enabled. Specify /EHsc。如果你进入 project properties->c/c++->Code generation->enable c++ exceptions 并将其设置为 Yes (/EHsc)（实际上它应该是默认值），你就可以开始了。

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