Warning.txt - error descriptions

http://mwmodders.com/scriptingnotes.html (С)

 

Certainly the most dreaded errors one will encounter in scripting are 'Right Eval,' 'Left Eval', and 'Infix to Postfix.' These errors do not show in the compiler, rather, they will only spring up when the dirty line of code causing them fires. Which means, in many cases, one may be able to successfully test much of a script until a certain area fires. In his guide, GhanBuriGhan cites specific causes for these errors that may cause them. I have always found, however, that differentiating between the three errors is virtually useless, as any dirty line can seemingly cause any of the three dreaded errors. Here are some tips if you find yourself in a predicament with one of these errors:

 

    34th variable - make sure you NEVER use the 34th variable declared in the script. Shorts and floats count separately, so it's helpful to keep the short declaration section separate from the float declaration section, so that counting each is easier. Declare the 34th variable as "DontUse" or something similar, to remind yourself not to use the variable. Attempting to set a 34th variable to any value will almost certainly yield an error. Usually a Right Eval.

    Undeclared Variable - when you're dealing with a lot of different scripts and use similar variable names among them, especially temporary variables, it's easy to forget to declare a variable, and luckily, the compiler will usually catch it. However, if the variable has been declared in ANY other script in the game, the compiler will treat it as declared and will not give a compile error, even though the variable hasn't actually been declared in the script. This will usually yield a Right Eval.

 

Together, these two make up about 90% of the evals that I see occurring in my own scripts.