static void Main(string[] args)
{
string animalType = "";
double height = 0;
double weight = 0;
start:
while (true)
{
Console.Write("請輸入動物類別 (如：男M / 女F / 貓C)：");
animalType = Console.ReadKey().Key.ToString();
Console.WriteLine();
if (animalType != "M" && animalType != "F" && animalType != "C")
{
Console.WriteLine("格式錯誤，請重新輸入");
}
else
{
break;
}
}
while (true)
{
Console.Write("請輸入身高(cm)：");
bool isHeight = double.TryParse(Console.ReadLine(), out height);
if (height <= 0 || !isHeight)
{
Console.WriteLine("格式錯誤，請重新輸入");
}
else
{
break;
}
}
while (true)
{
Console.Write("請輸入體重(kg)：");
bool isWeight = double.TryParse(Console.ReadLine(), out weight);
if (weight <= 0 || !isWeight)
{
Console.WriteLine("格式錯誤，請重新輸入");
}
else
{
break;
}
}
Animal animal = new Man(height, weight);
switch (animalType)
{
case "F":
animal = new Woman(height, weight);
break;
case "C":
animal = new Cat(height, weight);
break;
}
Console.WriteLine($" BMI值：{animal.bmi}, 計算結果：{animal.GetBmiResult()}");
Console.Write("輸入r重新開始，輸入r以外的鍵結束程式：");
string restart = Console.ReadKey().Key.ToString();
Console.WriteLine();
switch (restart)
{
case "R":
goto start;
default:
return;
}
}