/// <summary>
/// 根据运算符，得到相应的运算器对象
/// </summary>
/// <param name="symbol">运算符</param>
/// <returns>运算器对象</returns>
public static Calculator GetCalculator(string symbol)
{
switch (symbol)
{
case "+":
return(Summator.Create());
case "-":
return(Subtractor.Create());
case "*":
return(Multiplier.Create());
case "/":
return(Divider.Create());
case "//":
return(Aliquot.Create());
case "%":
return(Remainder.Create());
case "**":
return(Exp.Create());
case "!":
return(Factorial.Create());
default:
return(null);
}
}
/// <summary>
/// 创建加法器
/// </summary>
/// <returns>返回加法器</returns>
public static Summator Create()
{
if (summator == null)
{
summator = new Summator(); // 如果计算器为空，则创建
}
return(summator);
}
