Using the Debug feature

[PhilOfPerth]

@Pete
I ran your code with betatest on then off, and got the commented version both times.
It looks like what I want, thank you, but I need to experiment a bit with it. 

Here's the results:
Input 1 to betattest or 0 to run withut comments: ? 1
Number to find the square root of: 4
y$: j&& = 1 y$ is same as j&& = 1 * 1 = 1
y$: j&& = 2 y$ is same as j&& = 2 * 2 = 4
y$ = (sqrt$ * 2 ~ j&& * J&&): 2 * 2 = 4 ~ 1 = 41 * 1 = 41
2
Input 1 to betattest or 0 to run withut comments: ? 0
Number to find the square root of: 4
y$: j&& = 1 y$ is same as j&& = 1 * 1 = 1
y$: j&& = 2 y$ is same as j&& = 2 * 2 = 4
y$ = (sqrt$ * 2 ~ j&& * J&&): 2 * 2 = 4 ~ 1 = 41 * 1 = 41
2
Input 1 to betattest or 0 to run withut comments: ?