problem 3 4 5 6 6 in julia

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diff --git a/julia/004-largest_palindrome_product.jl b/julia/004-largest_palindrome_product.jl
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+###
+# Largest palindrome product
+# Problem 4
+#
+# A palindromic number reads the same both ways. The largest palindrome made from the
+# product of two 2-digit numbers is 9009 = 91 × 99.
+# Find the largest palindrome made from the product of two 3-digit numbers.
+###
+
+function is_palindrom(n)
+    s = string(n)
+    s == reverse(s)
+end
+
+
+top = -1
+
+for x in 100:999
+    for y in 100:999
+        if is_palindrom(x * y)
+            global top = max(top, x * y)
+        end
+    end
+end
+
+println(top)