int amount = 14;
String s = String.Format("這是今年吃的第{0}顆柚子",amount);
Console.WriteLine(s);
//這裡會輸出這是今年吃的第14顆柚子
Consol.WriteLine("Hello World")
string b = "world.";
Console.WriteLine("Hello {0}", b);
var num=58.7344;//a.ToString()+" "+"km/hr";
string editednum=num.ToString("0.0");//58.7