World: r4wp

Results I get: 
 myresult was: 1
 myresult is : 0.5
 myresult is : 1.3563418576693e+243

Ieks!

I seem to remember that floats and integers can't be intermixed yet

As the float functions from the mt19937 source depend on int-to-float 
conversion, this better be tested some more.

that is why int-to-float from user.reds by Rebolek from the contributions 
link was recommended to me earlier.

int-to-float seems OK here, but not * 2: try * 2.0

Or even * int-to-float 2

Ah sure! Good you are here tonight.

How easy it is to make this error!

It would be better if it gave an error

Better so indeed or just compute to what it should be.

Sure, but then something else would be unimplemented instead

This looks much better again.

Now it prints that 0.5 times 2.0 is 1 (note not 1.0)

Yes, that's a bit unexpected

myresult was: 1
 myresult is : 0.5
 myresult is : 1
It did also on the first printed line. Could be a design choice.

int-to-float causes a error. Or does it? I added some prints and 
inbetween steps
	genrand-real2: func [
		return: [float!] 
		/local result [float!] between [float!] intermediate [integer!]
	][  
	    intermediate: genrand-int32
	    print ["intermediate: " intermediate lf]
		;result: int-to-float genrand-int32
		between: int-to-float intermediate
        print ["between: " between lf]
		result: ((1.0 / 4294967296.0) * between) ;; divided by 2^32 
		return result
	]

ON the second value the program errs:
intermediate: -1734706621
between: -1734706560
-0.40389284491539 intermediate: -1052231088

*** Runtime Error 9: float invalid operation
*** at: 00002033h
logout

When I make my testprogram for user.reds tell me why int-to-float 
behaves like this:
intval: -1052231088
floval: int-to-float intval
print ["intval: " intval " lets floval become: " floval lf]
The output is not a runtime error:
intval: -1052231088 lets floval become: -1052231040

But the print line was not executed in my real program? I only have 
one user.reds file in my directory. Suggestions?