CODEWITHSUNDEEP
calculatorbasicti-basic
nicobld
nicobld

Reputation: 129

Ti Basic (Ti-82 Plus) - Replace variable by numbers and X's

I whant to replace a variable by some numbers and X's or even a direct equation like 3X+2 = 5

Yeah I'm codding a resolution of equations :D (i'm borred)

This is what i've written right now

Prompt E
Prompt F

while T [not equal to] 1
X+0.01 -> X

If E=F
1 -> T
If E=F
Disp X
End

So what i'm trying to do is say E is 3X+2 and F is 5 I test all the possible solutions by replacing X by every number and when it equals to F (so 5) i stop and print X

It works when I replace directly in the code the E and F but it's long and useless if I whant to use it.

If 3X+2=5
1 -> T
If 3X+2=5
Disp X
End

This works !! So is it possible for the calculator to interpret that i'm saying that E is a long sentence ?

Thanks so much !

Ps : Don't worry if i make mistakes in my orthograph, (i'm french) Ps 2 : Don't just tell me how to do a resolution of equation (Don't tell me what I can't do !! (lost (4 8 15 16 23 42)))

Upvotes: 2

Views: 547

Answers (2)

user3932000
user3932000

Reputation: 629

Are you asking how to input "3X+2" into the variable E?

In this case, you wouldn't want to use a variable, because variables in TI-84 can only be numbers. You would use strings, which store text instead of numbers. Go to VARS > String... to see the list of strings available.

Now, to find the numerical value of strings, you would use the expr( command. For example, expr("3X+2") where X=1 would return 5. You can find the expr( command in the catalog (2ND + 0).

Upvotes: 1

lirtosiast
lirtosiast

Reputation: 592

You're looking for equation variables.

An expression can be stored into an equation variable such as Y₁; it will be evaluated every time it is encountered.

"3X+2→Y₁
5→X
Disp Y₁
-2→X
Disp Y₁

The above will print

17
-4

Equation variables are easier to use than strings, because they are automatically evaluated. There's no need to use expr(. To find the equation variables, press VARS > ENTER.

Upvotes: 1

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