Added function to reverse a 32 bit signed int

Author: Ahmed, Mehtab

reverse32bitsignedint.py

@@ -0,0 +1,19 @@
+# reverse a 32 bit signed int
+# if ans overflows then returns 0
+def reverse32bitsignedint(n):
+    is_negative = 0
+    if n < 0:
+        is_negative = 1
+        n = -n
+    ans = 0
+    while n:
+        quotient = n // 10
+        reminder = n % 10
+        n = quotient
+        ans = ans * 10 + reminder
+    limit = 1 << 31
+    if is_negative:
+        ans = -ans
+    if (ans <= -limit) or (ans >= limit - 1):
+        return 0
+    return ans