equation calculator
Author 
Message 
nelson

Posted: Thu Dec 04, 2003 9:44 pm Post subject: equation calculator 


ok ,,
azn sensation called me a cheater for asking for codes,
so now i ask nicely if anyone can help me
i need to know how to do this:
user inputs an equation and i need the equation ready for
calculations, so i can get answers by inputing xvalues in to the equaition
the program should be able to handle brackets and proper bedmas
example of equation:
y = ((x+3)**2 )**(x+4)+ (x+3x*4x+5x))/3
how would i do this!!?? i'm a newbe.... so plz be detailed ^^
nel 





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Dan

Posted: Thu Dec 04, 2003 10:01 pm Post subject: (No subject) 


well yout going to have to use a loop, substrings and some testing staments to reaed eacech chartier in the input and test to see what it is and what to do.
some things you will have to do:
test, keep track of brackets and the value in them
test for math oprations and what to do for each one (*,+,,/,**,ect)
use BEDMAS rules you will have to keep track of number befor and after the operation and may be more depending on brackets
chack for x or any other letter and sub in the inputed value.
this will not be that easy to do right, but there are other equatin and math slolving porgames sumited in the turing section witch can help you out. 
Computer Science Canada
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Andy

Posted: Thu Dec 04, 2003 10:01 pm Post subject: (No subject) 


oo man... i'm not gonna give you the whole code cuz i'm lazy, but i'll give you the basic concept. you get the equation from the user as a string, then get values for x, now using index, replace all the x with the number, and use strint and such to solve 





Dan

Posted: Thu Dec 04, 2003 10:06 pm Post subject: (No subject) 


dodge_tomahawk wrote: ...use strint and such to solve
oh you going to do it the cheep way, lol. i like that... 
Computer Science Canada
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Andy

Posted: Thu Dec 04, 2003 10:08 pm Post subject: (No subject) 


how else would u do it? if ur not gonna strint the numbers and have if statements for the operators? 





Dan

Posted: Thu Dec 04, 2003 10:12 pm Post subject: (No subject) 


oOo, nvm i thougth you ment somting eltes. i forgot turing dose not do that (as in if you have string "1+1" it whould go to 2). i have been doing to many languges lattey all geting mixed together. sory about that mixup. (seems like i am making to many today) 
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nelson

Posted: Thu Dec 04, 2003 10:15 pm Post subject: hmm 


what do you mean by "using index"
and is that a dark templar? 





Andy

Posted: Thu Dec 04, 2003 10:20 pm Post subject: (No subject) 


index is a function that returns the first occurence of a substring inside a string. type that on turing and press F9, and yes that is a dark templar as you can see from the cape 





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nelson

Posted: Thu Dec 04, 2003 10:28 pm Post subject: d 


ok i know how to keep track of things , numbers, +*/ using strint
and stuff
but i woudn't know how to program where in the equation the calculation
should start
cool
my id is nelsonmuntx in battlenet, if you still play and interested
and HA ! it doesn't say i'm newbe anymore,, TAKE THAT TONY!@! 





Tony

Posted: Thu Dec 04, 2003 11:33 pm Post subject: (No subject) 


pff
thats exactly what I told you to do Brian, but NOO...
let me try it again... you start from outside the brackets (if it makes it any easier, put the entire function into another set of brackets to start everything off) and consentrate just on whats inside of those brackets.
if there're another set of brackets inside there, you take just that set and solve that first.
You basically move in, then move out. You'd have to use a selfcalling function that accepts a string with part/whole function to break it appart into pieces.
Maybe you'll listen to me now that this is writen down on a forum 
Tony's programming blog. DWITE  a programming contest. 





