*
* @return 無數  
*/  
function main() {  
    // 初始化計算機  
    const calculator = new Calculator();

    // 讓計算機遷行  
    while (true) {  
        // 請求計算功能  
        const request = await calculator.request();

        // 根據請求瀏覽功能  
        if (request.type === "CALCULATION") {  
            // 計算結果顯示在螢幕顯示欄上  
            const result = await calculator.calculate(request.value);  
            console.log(`${request.value} + ${result} = ${result}`);  
        } else if (request.type === "KEYPRESS") {  
            // 顯示按鍵隨態  
            const keys = request.value.split("");  
            console.log(`按鍵:${keys.join(" ")}`);  
        }  
    }  
}

// 初始化計算機  
const calculator = new Calculator();

// 尋找請求  
const request = await calculator.request();

// 根據請求操作  
if (request.type === "CALCULATION") {  
    // 計算  
    const result = await calculator.calculate(request.value);  
    // 顯示結果  
    console.log(`${request.value} + ${result} = ${result}`);  
} else if (request.type === "KEYPRESS") {  
    // 顯示按鍵隨態  
    const keys = request.value.split("");  
    console.log(`按鍵:${keys.join(" ")}`);  
}