给定一个整数，颠倒它的各位数，比如输入123，将返回321
package reed.flyingreed.algo
/**
* Created by thinkreed on 2017/6/27.
*/
fun reverse(x: Int): Int {
var result = 0
var origin = x
while (origin != 0) {
val tail = origin % 10
val newResult = result * 10 + tail
//如果溢出，新结果反操作后将不会等于原结果
if ((newResult - tail) / 10 != result) {
return 0
}
result = newResult
origin /= 10
}
return result
}
