` /浮点数计PI(π): long double Pild = 3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196; //输出有效为： 3.141592653589793115997963468544185161590576171875 //有效位： 3.141592653589793 //等价 //PILD01=3.141592653589793; long double Pi2ld = 3.1415926535897932; ` 上个“调试”界面图：  上一个“日志”界面：  ``` #include "stdafx.h" #include "Project1car181101.h" #include<iostream> #include<fstream> using namespace std; #define MAX_LOADSTRING 100 // 全局变量: HINSTANCE hInst; // 当前实例 WCHAR szTitle[MAX_LOADSTRING]; // 标题栏文本 WCHAR szWindowClass[MAX_LOADSTRING]; // 主窗口类名 ofstream cou02t; // 此代码模块中包含的函数的前向声明: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM); int APIENTRY wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nCmdShow) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); // TODO: 在此处放置代码。 //调用Console控制台 ***AllocConsole(); #pragma warning(disable:4996) _tfreopen(TEXT("CONOUT$"), TEXT("w"), stdout); _tfreopen(TEXT("CONOUT$"), TEXT("w"), stderr); _tfreopen(TEXT("CONIN$"), TEXT("r"), stdin); #pragma warning(default:4996) _tsetlocale(LC_ALL, TEXT("chs"));*** //输出到文档(日志) cou02t.open("f://log181123car_cou02t181124a1.txt"); // 初始化全局字符串 LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadStringW(hInstance, IDC_PROJECT1CAR181101, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); // 执行应用程序初始化: if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_PROJECT1CAR181101)); MSG msg; // 主消息循环: while (GetMessage(&msg, nullptr, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return (int) msg.wParam; } // // 函数: MyRegisterClass() // // 目标: 注册窗口类。 // ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEXW wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_PROJECT1CAR181101)); wcex.hCursor = LoadCursor(nullptr, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_PROJECT1CAR181101); wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassExW(&wcex); } // // 函数: InitInstance(HINSTANCE, int) // // 目标: 保存实例句柄并创建主窗口 // // 注释: // // 在此函数中，我们在全局变量中保存实例句柄并 // 创建和显示主程序窗口。 // BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { hInst = hInstance; // 将实例句柄存储在全局变量中 HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr); if (!hWnd) { return FALSE; } ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } // // int setpixe02l(HDC hdc, int x1, int y1, COLORREF color1) { int y2 = 400 - y1; SetPixel(hdc, x1, y2, color1);//500-y1, color1); cou02t << "[y2:" << y2 << "]";// << endl; return 1; } //函数目标：处理图像（重绘） int wm01paint01(HDC hdc) { int x01 = 100; int y01 = 50; for (int i = 1; i < 99; ++i) { int x02 = x01 + i; SetPixel(hdc, x01+i, y01+i , RGB(200, 0, 0));//Red色 setpixe02l(hdc, x01+i , y01+i , RGB(0,200, 0));//green色 cou02t << "[x02:" << x02 << "]";// << endl; }//for210i cout << "[x01:" << x01 << endl; return 1; } // // 函数: WndProc(HWND, UINT, WPARAM, LPARAM) // // 目标: 处理主窗口的消息。 // // WM_COMMAND - 处理应用程序菜单 // WM_PAINT - 绘制主窗口 // WM_DESTROY - 发送退出消息并返回 // // LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_COMMAND: { int wmId = LOWORD(wParam); // 分析菜单选择: switch (wmId) { case IDM_ABOUT: DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About); break; case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } } break; case WM_PAINT: {//case110 PAINTSTRUCT ps; HDC hdc = BeginPaint(hWnd, &ps); // TODO: 在此处添加使用 hdc 的任何绘图代码... // wm01paint01(hdc); // EndPaint(hWnd, &ps); }//case110 break; case WM_DESTROY: ``` KBJFW-NXHK6-W4WJM-CRMQB-G3CDH（请比尔家恕俺贫穷不义,等俺把娃养大定当回报Micro$oft和IT社会）