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Task/Digital-root-Multiplicative-digital-root/Icon/digital-root-multiplicative-digital-root.icon

@@ -0,0 +1,24 @@
+procedure main(A)
+    write(right("n",8)," ",right("MP",8),right("MDR",5))
+    every r := mdr(n := 123321|7739|893|899998) do
+        write(right(n,8),":",right(r[1],8),right(r[2],5))
+    write()
+    write(right("MDR",5),"  ","[n0..n4]")
+    every m := 0 to 9 do {
+        writes(right(m,5),": [")
+        every writes(right((m = mdr(n := seq(m))[2],.n)\5,6))
+        write("]")
+        }
+end
+
+procedure mdr(m)
+    i := 0
+    while (.m > 10, m := multd(m), i+:=1)
+    return [i,m]
+end
+
+procedure multd(m)
+    c := 1
+    while m > 0 do c *:= 1(m%10, m/:=10)
+    return c
+end