Scratch

Yay, 9 pages! 

Last edited by Hardmath123 (2011-04-20 05:26:15)

Sci, you have make an engine that:

•Converts the input to a list
  ~Keeps numbers and operation names like sin and sqrt as 1 item.
  ~Ex: Converts sqrt 1 + 2 into:
      ·sqrt
      ·1
      ·+
      ·2
•Ignores anything that isn't a number or an operator's symbol
•Ignores commas in numbers: 1,000 converts to 1000

and

•remove commas (like in 1,000)
•replace constant's names with values: e, π, ϕ, pi, phi, and a few more.

Got it, sounds good.

Hardmath123 wrote:

Okay, I'm going to assign a few jobs:
...
hpotter134: Once amercbu's done, add something to report the innermost nested bracket set. So 1+(2+3) would report 2+3

What would expressions such as (1+2)*(3+4) or ((1+2)*(3+(4+5))) report? Or do you want it to report a list of all of the innermost bracketed sets, and maybe their locations?

Last edited by hpotter134 (2011-04-20 20:38:58)

That could just as easily be solved with just one variable, it would start as zero, and for every ( there would be 1 added to the varable, and for every ) 1 would be subtracted from the varable. if at the end the variable was not equal to zero, there would be a syntax error.

hpotter134 wrote:

Another idea: To check if the parenthesis are unmatched, we can have two variables in the list setup engine, one for ( and one for ), and at the end of the setup we can check whether or not there are sufficient parenthesis, ie var(=var)

And after testing some stuff on my graphing calculator, I got an idea: If there are less ) parenthesis than ( parenthesis, we can

Code:

Repeat var( - var)
     add ) to list

That way, 5(8 = 5(8) = 40

Just an idea, but it might be a nice feature.

hpotter134 wrote:

Another idea: To check if the parenthesis are unmatched, we can have two variables in the list setup engine, one for ( and one for ), and at the end of the setup we can check whether or not there are sufficient parenthesis, ie var(=var)

And after testing some stuff on my graphing calculator, I got an idea: If there are less ) parenthesis than ( parenthesis, we can

Code:

Repeat var( - var)
     add ) to list

That way, 5(8 = 5(8) = 40

Just an idea, but it might be a nice feature.

TI 84 graphing calculator?  That's what I have.  I think that this could be achieved, as applejack said, with one variable.  After scanning the list, if the number of leftpar-rightpar is greater than 0, then you add a certain number of rightpar on the end.  If the number of leftpar-rightpar is less than 0, you add some leftpar at the beginning.

TI84? I have one too! I'm making tetris on it.

amcerbu wrote:

hpotter134 wrote:

Another idea: To check if the parenthesis are unmatched, we can have two variables in the list setup engine, one for ( and one for ), and at the end of the setup we can check whether or not there are sufficient parenthesis, ie var(=var)

And after testing some stuff on my graphing calculator, I got an idea: If there are less ) parenthesis than ( parenthesis, we can

Code:

Repeat var( - var)
     add ) to list

That way, 5(8 = 5(8) = 40

Just an idea, but it might be a nice feature.

TI 84 graphing calculator?  That's what I have.  I think that this could be achieved, as applejack said, with one variable.  After scanning the list, if the number of leftpar-rightpar is greater than 0, then you add a certain number of rightpar on the end.  If the number of leftpar-rightpar is less than 0, you add some leftpar at the beginning.

[/offtopic]

Should we include a pick random operator? Some calcs use that...

TRocket wrote:

can i join i can program the brackets (i used them in my programming language in scratch)

Sorry, but I think we have enough members right now. We also have someone who will do brackets (hpotter134). Anyways, it's not me making decisions, it's Hardmath123, and he won't be back for a few days. 
------------------
What I've done so far:
Adds numbers into 1 item
Adds ops
Adds brackets
Does the following multiple letter ops:
  sqrt
  abs (and ||)
  mod
  round
  sin
  cos
  tan
  atan
  asin
  acos

Last edited by scimonster (2011-04-22 08:11:07)

scimonster wrote:

What I've done so far:
Adds numbers into 1 item
Adds ops
Adds brackets
Does the following multiple letter ops:
  sqrt
  abs (and ||)
  mod
  round
  sin
  cos
  tan
  atan
  asin
  acos

You may have a TI84 or not, but I think that the multi-letter operations should work only within parentheses.  That is, sin(5), not sin 5, sqrt(5), not sqrt 5, etc.  That will clear up any unclear operations like sin 5*5: sin(5)*6 or sin(5*6)?  The "sin()" part itself will work as a unit, so 5sin(5)+2 will report 5*sin(5)+2. 

As far as your list of operations goes, I don't see anything missing. 

I think we should also provide support for user defined variables, so an input that reads "define x" will create a variable named x, and setting a variable's value will be achieved by "x=8" (storing values can be handled by two parallel lists, one for names, one for values). 

Me- Awaiting deployment.

applejack wrote:

hardmath told us not to get ahead of ourselves yet, should we include i ?

I don't think we should.  The calculator would have to express things in terms of i, and it won't want to deal with anything imaginary.

Last edited by amcerbu (2011-04-22 21:38:10)