7

Author: TedTran2019

ruby/7-Reverse-Integer.rb

@@ -0,0 +1,14 @@
+def reverse(x)
+  max = 0xffffffff >> 1
+  max_last_digit = max % 10
+  max_minus_digit = max / 10
+  reverse = 0
+  until x.zero?
+    digit = x.remainder(10)
+    return 0 if reverse.abs > max_minus_digit || (reverse.abs == max_minus_digit && digit > max_last_digit)
+
+    reverse = (reverse * 10) + digit
+    x = (x / 10.0).to_i
+  end
+  reverse
+end