release 1.4

add F>S word to the full version with floating point; improve LOGS.FTH and MATH.FTH

Author: Robert-van-Engelen

examples/LOGS.FTH

@@ -72,11 +72,11 @@ DECIMAL
   THEN
   2DUP 2DUP FTRUNC F= IF
     2DUP ['] F>D CATCH 0= IF
-      2SWAP 2DROP
       2DUP DABS 17. DU< IF
         DROP
         DUP 0< >R
         ABS >R
+        2DROP
         1E0
         BEGIN
           R@ 1 AND IF 2OVER F* THEN
@@ -91,11 +91,10 @@ DECIMAL
       THEN
       OVER 1 AND IF
         2OVER F0< IF
-          D>F 2SWAP FABS 2SWAP F^ FNEGATE EXIT
+          2DROP 2SWAP FABS 2SWAP F^ FNEGATE EXIT
         THEN
       THEN
-      D>F
-      2SWAP FABS 2SWAP
+      2DROP 2SWAP FABS 2SWAP
     ELSE
       2DROP
     THEN

examples/MATH.FTH

@@ -344,11 +344,11 @@ DECIMAL
   \ exponentiation by squaring r1^n when n is a small integer |n|<=16
   2DUP 2DUP FTRUNC F= IF \ r2 has no fractional part
     2DUP ['] F>D CATCH 0= IF \ r2 is convertable to a double n
-      2SWAP 2DROP \ drop old r2
       2DUP DABS 17. DU< IF \ |n| <= 16
         DROP \ drop high order of n
         DUP 0< >R \ save sign of n
         ABS >R \ save |n|
+        2DROP \ drop old r2
         1E0 \ -- r1 1.0
         BEGIN
           R@ 1 AND IF 2OVER F* THEN
@@ -363,11 +363,10 @@ DECIMAL
       THEN
       OVER 1 AND IF \ n is odd
         2OVER F0< IF \ r1 is negative
-          D>F 2SWAP FABS 2SWAP F^ FNEGATE EXIT \ return -(|r1|^n)
+          2DROP 2SWAP FABS 2SWAP F^ FNEGATE EXIT \ return -(|r1|^n)
         THEN
       THEN
-      D>F \ convert even integer n back to r2
-      2SWAP FABS 2SWAP \ we want to return |r1|^r2
+      2DROP 2SWAP FABS 2SWAP \ we want to return |r1|^r2
     ELSE
       2DROP \ drop copy of r2
     THEN