写一段C语言代码，当用户按鼠标左键时，同时输出键盘的WSAD键

在C语言中，直接检测鼠标点击事件并结合键盘按键并非原生功能，因为这通常需要操作系统提供的API或底层的图形库支持，如Windows API或Linux X Window系统。然而，我们可以创建一个简单的窗口程序，通过监听鼠标的点击事件和键盘输入，然后在一个特定条件下模拟这样的行为。这里假设我们是在Windows平台上使用Windows API。

#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    switch (message) {
        case WM_LBUTTONDOWN: // 鼠标左键按下
            if (GetAsyncKeyState(VK_W)) { // 检查W键是否按下
                printf("Mouse left button down and W is pressed.\n");
            }
            break;
        case WM_KEYDOWN: // 键盘按下
            if (wParam == VK_W) { // 如果是W键
                printf("W key is pressed while mouse left button is down.\n");
            } else if (wParam == VK_A || wParam == VK_D || wParam == VK_S) { // 对其他键处理...
                // ...类似地检查A、D、S键
                printf("Other keys pressed while mouse left button is down.\n");
            }
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

int main() {
    WNDCLASS wc = {
        .style         = CS_HREDRAW | CS_VREDRAW,
        .lpfnWndProc   = WndProc,
        .hInstance     = GetModuleHandle(NULL),
        .ClassName     = "WindowClass",
        .hCursor       = LoadCursor(NULL, IDC_ARROW),
        .hbrBackground = (HBRUSH)(COLOR_WINDOW + 1)
    };

    RegisterClass(&wc);

    HWND hWnd = CreateWindow(
        "WindowClass", 
        "Press W while holding left mouse button", 
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, 
        CW_USEDEFAULT, 
        640, 
        480, 
        NULL, 
        NULL, 
        GetModuleHandle(NULL), 
        NULL
    );

    ShowWindow(hWnd, SW_SHOW);
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}