10/01/04 09:34:39
>>12
使用言語：Scala
scala> def f1(n:Int):Int={var r=0;var a=n;while(a>0){r=10*r+a%10;a/=10};r}
f1: (Int)Int
scala> f1(987654321)
res72: Int = 123456789
scala> def f2(n:Int):Int={n.toString.reverse.toInt}
f2: (Int)Int
scala> f2(987654321)
res73: Int = 123456789