Create: 7-Reverse-Integer.swift

javiermon · Aug 31, 2022 · 52fc651 · 52fc651
1 parent c633dda
commit 52fc651
Showing 1 changed file with 22 additions and 0 deletions.
diff --git a/swift/7-Reverse-Integer.swift b/swift/7-Reverse-Integer.swift
@@ -0,0 +1,22 @@
+class Solution {
+ func reverse(_ x: Int) -> Int {
+ let MIN = Int32.min
+ let MAX = Int32.max
+
+ var res = 0
+ var value = x
+ while value != 0 {
+ let digit = value % 10
+ value /= 10
+
+ if res > MAX / 10 || (res == MAX / 10 && digit >= MAX % 10) {
+ return 0
+ }
+ if res < MIN / 10 || (res == MIN / 10 && digit <= MIN % 10) {
+ return 0
+ }
+ res = (res * 10) + digit 
+ }
+ return res
+ }
+}