Merge pull request #2648 from Inbaselvan-ayyanar/patch-3

Update gcd.py

Author: geekcomputers

gcd.py

@@ -6,6 +6,7 @@
 b = int(input("Enter number 2 (b): "))
 
 i = 1
+gcd=-1
 while i <= a and i <= b:
     if a % i == 0 and b % i == 0:
         gcd = i