----------------------------------- chrispminis Tue Mar 14, 2006 2:48 pm Syntax Typo? ----------------------------------- Yeah, this isn't a big problem. I've just been staring at my code for about 40 minutes, and I still haven't found the problem. There are 2 errors. One is for a string literal that should end the line, the other is a syntax error expecting then. %Text Calculator %by : Chris Pan %Evaluates expressions by reading and interpreting strings %Don't Steal %Variables var stringy : string var number : real := 0 var mark, negmark : int var string1, string2 : string var dec, neg : boolean := false var maxsymbol : int := 10 type prioritize : record svalue : string smark : int spriority : int sused : boolean end record var symbol : array 1 .. maxsymbol of prioritize for i : 1 .. maxsymbol symbol (i).svalue := " " symbol (i).smark := 0 symbol (i).spriority := 0 symbol (i).sused := false end for %Functions function stringreal (str : string) : real mark := index (str, ".") negmark := index (str, "-") if mark > 0 then dec := true end if if negmark > 0 then neg := true end if for i : 1 .. length (str) if str (i) >= "1" and str (i) "9" then symbol (i).sused := true symbol (i).svalue := stringy (i) symbol (i).smark := i end if end for for i : 1 .. length (stringy) if symbol (i).sused = true then if symbol (i).svalue = "q" or symbol (i).svalue = "h" then symbol (i).spriority := 7 elsif symbol (i).svalue = "=" then symbol (i).spriority := 6 elsif symbol (i).svalue = "~" or symbol (i).svalue = "" then symbol (i).spriority := 5 elsif symbol (i).svalue = "+" or symbol (i).svalue = "-" then symbol (i).spriority := 4 elsif symbol (i).svalue = "x" or symbol (i).svalue = "X" or symbol (i).svalue = "*" or symbol (i).svalue = "/" then symbol (i).spriority := 3 elsif symbol (i).svalue = "^" or symbol (i).svalue = "&" then symbol (i).spriority := 2 elsif symbol (i).svalue = "(" then symbol (i).spriority := 1 end if end if end for %Test Output for i : 1 .. length (stringy) if symbol (i).sused then put symbol (i).svalue put symbol (i).smark put symbol (i).spriority end if end for Here's my code, I was just testing my prioritizing, for BEDMAS. I am sure the error is linked to an extra " somewhere but I can't find it! Please help. ----------------------------------- Delos Tue Mar 14, 2006 3:27 pm ----------------------------------- elsif symbol (i).svalue = "\^" or symbol (i).svalue = "&" then Not sure if it achieves what you want it to though... ----------------------------------- chrispminis Tue Mar 14, 2006 3:33 pm ----------------------------------- I'm not sure what you are trying to point me towards. But where did the "\^" come from? Im trying to prioritize them, "&" is my chosen square root sign. So exponents and square root go to the same priority level. ----------------------------------- pavol Tue Mar 14, 2006 4:48 pm ----------------------------------- im not sure, you have more knowledge in this matter than i do, but if you take ^ out of: elsif symbol (i).svalue = "^" or symbol (i).svalue = "&" then symbol (i).spriority := 2 to make it: elsif symbol (i).svalue = "" or symbol (i).svalue = "&" then symbol (i).spriority := 2 i know it probably doesn't make your program do what you want, but what i'm trying to point out is that maybe "^" is the problem and maybe it is some kind of thing held special by Turing and you're not really allowed using it. hope it gives some insight into your problem :) ----------------------------------- Delos Tue Mar 14, 2006 4:55 pm ----------------------------------- pavol is on the right track. '^' is a 'special thing' in Turing, but you are allowed to use it, provided you know how. In this case, if you wish to use it in a string, you need to provide the escape character '\' first. This is similar to using things like '\n' or '\"'. I'm guessing the '^' would be for an exponent... ----------------------------------- MysticVegeta Tue Mar 14, 2006 6:42 pm ----------------------------------- no ** is for exponent. ^ is reserved for other string purpose, and yes you would need to put "\" before the ^ so it would be "\^", its the same as saying "^", its for the same reason as for in java when you have to put "\\+" due to regex issues. ----------------------------------- Delos Tue Mar 14, 2006 8:46 pm ----------------------------------- no ** is for exponent. ^ is reserved for other string purpose, and yes you would need to put "\" before the ^ so it would be "\^", its the same as saying "^", its for the same reason as for in java when you have to put "\\+" due to regex issues. I meant in his proggie. You know, typing in "4^3" meaning four raised to the third power... ----------------------------------- chrispminis Wed Mar 15, 2006 2:16 pm ----------------------------------- well, Ill try that, that makes sense. And Delos it is ** for exponent. Turing doesn't evaluate 2^3 = 8. Just another thing. If you wanted the backslash character (\) in a string would it be "\\"? ----------------------------------- [Gandalf] Wed Mar 15, 2006 4:39 pm ----------------------------------- ^ is the more 'universal' exponent representation, while ** is what Turing uses since ^ is reserved for other things. Yes, to output a backslash you would use escape + \, or else "\\". ----------------------------------- Clayton Wed Mar 15, 2006 4:57 pm ----------------------------------- i have to ask what do you mean by using backslash as an escape character? what is an escape character and what are they used for? i know this is off topic but i didnt want to start another thread just for this ----------------------------------- Delos Wed Mar 15, 2006 10:50 pm ----------------------------------- Well, the most practical interpretation would be that you 'escape' from the literal string that you're using, and can implement a secondary command instead. So, for instance, you have "Hello /n World", which prints Hello and World on seperate lines. Since it's all in one string, the '/' allows you to drop out from the usual translation and actually do some manipulations. This is rather limited though, since any more graphically-oriented procedures (Font. etc) don't support this (seeing as they create pictures). And of course, everyone loves pictures. :wink: