炒鸡计算机

#include <windows.h>
#include <sstream>
#include <string>
#include <cmath>

HINSTANCE hInst;
HWND hwndDisplay, hwndButton[16];
std::string currentInput = "";
std::string result = "";

// 计算函数，支持加减乘除
double calculate(const std::string& input) {
    double num1 = 0.0, num2 = 0.0;
    char op = '+';
    size_t pos = 0;

    // 遍历输入字符串，进行计算
    for (size_t i = 0; i < input.size(); ++i) {
        if (isdigit(input[i]) || input[i] == '.') {
            // 处理数字和小数点
            num2 = num2 * 10 + (input[i] - '0');
            if (i < input.size() - 1 && input[i + 1] == '.') {
                // 如果是小数点，处理小数部分
                double decimal = 0.1;
                ++i; // 跳过小数点
                while (i < input.size() && isdigit(input[i])) {
                    num2 += (input[i] - '0') * decimal;
                    decimal *= 0.1;
                    ++i;
                }
                --i; // 回到正确的字符位置
            }
        } else if (input[i] == '+' || input[i] == '-' || input[i] == '*' || input[i] == '/') {
            // 根据操作符计算
            if (op == '+') num1 += num2;
            else if (op == '-') num1 -= num2;
            else if (op == '*') num1 *= num2;
            else if (op == '/') num1 /= num2;
            num2 = 0;  // 重新开始计算下一个数字
            op = input[i];  // 更新操作符
        }
    }
    // 最后一次运算
    if (op == '+') num1 += num2;
    else if (op == '-') num1 -= num2;
    else if (op == '*') num1 *= num2;
    else if (op == '/') num1 /= num2;

    return num1;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
    switch (msg) {
        case WM_CREATE: {
            // 创建显示框
            hwndDisplay = CreateWindow("EDIT", "", WS_CHILD | WS_VISIBLE | WS_BORDER | ES_RIGHT, 
                10, 10, 250, 30, hwnd, (HMENU)1, hInst, NULL);

            // 创建按钮
            const char* buttonLabels[] = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "C"};
            for (int i = 0; i < 16; ++i) {
                hwndButton[i] = CreateWindow("BUTTON", buttonLabels[i], WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
                    10 + (i % 4) * 60, 50 + (i / 4) * 50, 50, 40, hwnd, (HMENU)(i + 2), hInst, NULL);
            }
            break;
        }

        case WM_COMMAND: {
            if (LOWORD(wp) >= 2 && LOWORD(wp) <= 17) {
                // 获取按钮的标签
                int index = LOWORD(wp) - 2;
                const char* label = ((const char*[]){"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "C"})[index];
                
                if (label[0] == '=') {
                    // 计算结果
                    try {
                        double value = calculate(currentInput);
                        std::ostringstream oss;
                        oss << value;
                        result = oss.str();
                    }
                    catch (std::exception&) {
                        result = "Error";
                    }
                    currentInput = result;  // 显示结果后清空输入框
                } else if (label[0] == 'C') {
                    // 清空输入
                    currentInput = "";
                    result = "";
                } else {
                    // 更新输入
                    currentInput += label;
                }
                SetWindowText(hwndDisplay, currentInput.c_str());
            }
            break;
        }

        case WM_DESTROY:
            PostQuitMessage(0);
            break;

        default:
            return DefWindowProc(hwnd, msg, wp, lp);
    }
    return 0;
}

int main() {
    // 初始化窗口
    WNDCLASS wc = {};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = GetModuleHandle(NULL);
    wc.lpszClassName = "CalculatorWindowClass";

    if (!RegisterClass(&wc)) {
        return -1;
    }

    HWND hwnd = CreateWindowEx(0, "CalculatorWindowClass", "Calculator", WS_OVERLAPPEDWINDOW, 
        CW_USEDEFAULT, CW_USEDEFAULT, 280, 400, NULL, NULL, hInst, NULL);

    if (hwnd == NULL) {
        return -1;
    }

    ShowWindow(hwnd, SW_SHOW);
    UpdateWindow(hwnd);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}