calculator.rb

# 計算機作業

# 抓使用者輸入數字的函式
def InputNumber(iCount)
    _Number = 0;
    begin
        puts "====================="
        puts "請輸入第#{iCount}個數字";
        puts "====================="
        _Number = gets.chomp.to_i;
    end while !_Number.is_a?(Numeric) #判斷是否為數字
    return _Number;
end

#  抓使用者輸入運算符號的函式
def InputOperator()
    _Operator = "";
    begin
        puts "=============="
        puts "請輸入+，-，*，/";
        puts "=============="
        _Operator = gets.chomp;     
    end while (_Operator != "+") && (_Operator != "-") && (_Operator != "*") && (_Operator != "/") # 如果不是輸入+-*/就重複要求輸入
    return _Operator;
end

# 計算結果的函式
def CalculatorResult(iNumber1, iNumber2, iOperator)
    if iOperator == "+"
        return iNumber1 + iNumber2;
    elsif iOperator == "-"
        return iNumber1 - iNumber2;
    elsif iOperator == "*"
        return iNumber1 * iNumber2;
    elsif iOperator == "/"
        return iNumber1 / iNumber2;
    else
        return 0;
    end
end

# 建立一個無窮迴圈
begin
    _Number1 = InputNumber("1");
    _Operator = InputOperator();
    _Number2 = InputNumber("2");
    _Result = CalculatorResult(_Number1, _Number2, _Operator);

    puts "==================="
    puts "計算結果為 #{_Number1} #{_Operator} #{_Number2} = #{_Result}";
    puts "==================="

    puts "=================="
    puts "請問是否要繼續 y / n"
    puts "=================="
    _YorN = gets.chomp;
end while (_YorN == "Y") || (_YorN == "y") #檢查是否輸入的是Y或y這個字母