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Task/Happy-numbers/Harbour/happy-numbers.harbour

@@ -0,0 +1,33 @@
+PROCEDURE Main()
+   LOCAL i := 8, nH := 0
+
+   ? hb_StrFormat( "The first %d happy numbers are:", i )
+   ?
+
+   WHILE i > 0
+      IF IsHappy( ++nH )
+	?? hb_NtoS( nH ) + " "
+	--i
+      ENDIF
+   END
+
+   RETURN
+	
+STATIC FUNCTION IsHappy( nNumber )
+   STATIC aUnhappy := {}
+   LOCAL nDigit, nSum := 0, cNumber := hb_NtoS( nNumber )
+
+   FOR EACH nDigit IN cNumber
+      nSum += Val( nDigit ) ^ 2
+   NEXT
+
+   IF nSum == 1
+      aUnhappy := {}
+      RETURN .T.
+   ELSEIF AScan( aUnhappy, nSum ) > 0
+     RETURN .F.
+   ENDIF
+
+   AAdd( aUnhappy, nSum )
+
+   RETURN IsHappy( nSum )