Data update

Task/Babbage-problem/Julia/babbage-problem.julia

@@ -1,8 +1,13 @@
+"""
+    babbage(x::Integer)
+
+    Returns the smallest positive integer whose square ends in `x`
+"""
 function babbage(x::Integer)
-  i = big(0)
-  d = floor(log10(x)) + 1
-  while i ^ 2 % 10 ^ d != x
-    i += 1
+  i = big(0)   # start with 0 and increase by 1 until target reaached
+  d = 10^ndigits(x)  # smallest power of 10 greater than x
+  while (i * i) % d != x
+    i += 1  # try next squre of numbers 0, 1, 2, ...
   end
   return i
 end