首次用C++编写类代码遇LNK2001错误，请求技术支持

Hey there! Let's tackle your problem head-on—first that confusing linker error, then a quick tweak to your class code.

1. Resolving the LNK2001: unresolved external symbol "_WinMain@16" Error #

This error has nothing to do with your code logic—it's a project configuration issue in Visual Studio:

• Your code uses int main() (the standard entry point for console programs), but your project is set to build a Windows desktop application. Visual Studio's linker expects WinMain as the entry point for Windows apps, hence the missing symbol error.

Here's how to fix it:

• Right-click your project in the Solution Explorer → Select Properties
• Go to Configuration Properties → Linker → System
• Find the Subsystem dropdown, change it from Windows (/SUBSYSTEM:WINDOWS) to Console (/SUBSYSTEM:CONSOLE)
• Click Apply then OK, then rebuild your project.

2. Minor Code Improvement for Your myClass #

Your code will work once the linker issue is fixed, but there's a small best practice to add: your private member name isn't initialized when an object is created. While your output() function assigns it a value, it's better to initialize members in a constructor to avoid accidental use of uninitialized values.

Update your header file like this:

#pragma once
class myClass {
public:
    // Add a constructor to initialize the member variable
    myClass() : name(0) {}
    
    int output(int exp) {
        name = exp;
        return name;
    }
private:
    int name;
protected:
};

That's it! After adjusting the project setting and adding the constructor, your code should compile and run smoothly.

内容的提问来源于stack exchange，提问作者Jeroen