-static decNumber *decMultiplyOp (decNumber *, decNumber *, decNumber *,
- decContext *, uInt *);
-static decNumber *decNaNs (decNumber *, decNumber *, decNumber *, uInt *);
-static decNumber *decQuantizeOp (decNumber *, decNumber *, decNumber *,
- decContext *, Flag, uInt *);
-static void decSetCoeff (decNumber *, decContext *, Unit *,
+static decNumber *decMultiplyOp (decNumber *, const decNumber *,
+ const decNumber *, decContext *, uInt *);
+static decNumber *decNaNs (decNumber *, const decNumber *, const decNumber *, uInt *);
+static decNumber *decQuantizeOp (decNumber *, const decNumber *,
+ const decNumber *, decContext *, Flag, uInt *);
+static void decSetCoeff (decNumber *, decContext *, const Unit *,