Random 1 of four symbols

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Random 1 of four symbols

Socks 30 Jan 2008 21:01

I need, in a game, to have three of the mathematical operands (+, *, and -) selected, output on the graph screen, and then used to check an answer. Would the best way to do it be this:

:randInt(1,3→A //Or whatever variable
:If Ans=1
:Text(5,15,"+
:If Ans=2
:Text(5,15,"-
:If Ans=3
:Text(5,15,"*
:If Ans=1
:B+C→D
:If Ans=2
:B-C→D
:If Ans=3
:B*C→D
:For(X,1,500
://Custom input code
:End
: //Grading code based on X and comparing answer to correct answer.

Or is there a better way?

Fixed the broken code block — burr

---

/Socks

Last edited on 30 Jan 2008 21:38 by burr Show more

Re: Random 1 of four symbols

DarkerLine 30 Jan 2008 21:34

Try using sub(:

randInt(1,3→A
Text(5,15,sub("+-*",Ans,1

You can also use this method, together with expr( for actually working the operation, although that is a little harder to understand:

randInt(1,3→A
sub("+-*",Ans,1
Text(5,15,Ans
expr("B"+Ans+"C→D

An alternate method would use A in a piecewise expression:

randInt(1,3→A
Text(5,15,sub("+-*",Ans,1
(B+C)(Ans=1)+(B-C)(Ans=2)+BC(Ans=3→D

Last edited on 30 Jan 2008 22:38 by DarkerLine Show more

Re: Random 1 of four symbols

burr 30 Jan 2008 21:35

EDIT: DarkerLine beat me to the punch :P

You could place the symbols in a string, and then get the desired substring using the sub( command:

:randInt(1,3→A
:Text(5,15,sub("+-*",Ans,1

Last edited on 30 Jan 2008 21:36 by burr Show more