ChatterBox

This is a heavily commented but not indented program.
I just made it.

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;;MidNum - A program that generates the number ;;
;;that is in the middle of two other numbers...;;
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;Sets the screen size to 800X600 pixels, lets Blitz choose the resolution, and makes it a windowed program
Graphics 800,600,0,2
;Make the title of the program "MidNum Generator"
AppTitle "MidNum Generator"

;Tells the user what to do
Print "Welcome to the MidNum Generator, please type in a number."
;Gets the input from the user
Global num1=Input("")
;Tells the user what to do next
Print "Now type in another number. The MidNum Generator will"
Print "find the middle of the two numbers you typed in."
Global num2=Input("")
;Calls the user defined function, FindMidNum()
Newnum=FindMidNum()
;Prints the Middle Number
Print newnum
;Waits 5000 milliseconds (5 seconds) so the user has time to see the number
Delay 5000
;Starts the function FindMidNum()
Function FindMidNum()
;Does the math to find the middle number - Adds up the two numbers and divides by two
Return (num1+num2)/2
;Ends the Function, FindMidNum()
End Function
;Ends the program so that if you didn't compile it, you won't get that annoying "Program has ended" dialog
End