Calculator Questions

[Wajih]

why would you get to state = 2?

doesnt state = 1 include all the operations for double, triple digit operations, etc? or for each additional digit you have to go to another state? if stage = 1, then how would output lets say 23?

[Tony]

As you are entering the first number, do you need different states for having already entered 1, 2, or 3 digits? If so, how are they different?

[Wajih]

im thinking you can add as many numbers as you want until you hit the second set of numbers

[Tony]

Indeed. As such, you need just a few general states.

[Wajih]

im sorry, i dont understand what you are trying to say. so if its a 6 digit number it should be in state 5? but first, if its in state = 1, how would you output a number?

[Tony]

Wajih @ Thu Jan 13, 2011 9:49 pm wrote:

so if its a 6 digit number it should be in state 5?

Wajih @ Thu Jan 13, 2011 8:40 pm wrote:

im thinking you can add as many numbers as you want until you hit the second set of numbers

[Wajih]

oh i get what you are saying now. but for displaying the number that you want, how do you do it? do you add num and num to get num?

[Tony]

Yes, almost. But if the first digit is 1 and second is 2, you want to get 1&2=12, not 1+2=3.

[Wajih]

then how would you do something like that? would you add to num, multiply it? i will send you a part of my code :

if (button = 1) and (x >= 137) and (x <= 158) and (y >= 142) and (y <= 163) then
locate (5, 19)
num := 1
put num ..
end if

if (button = 1) and (x >= 194) and (x <= 214) and (y >= 142) and (y <= 163) then
locate (5, 19)
num := 2
put num ..
end if

do i have to change the num?

[Tony]

if you had 1 and there was another number entered, then that 1 should become 10 before the second number is added in, right?

[Wajih]

right, but how would it become 10? because its already given a value of 1 right? is there a code that allows a value to be added right before a second number is clicked?

[Tony]

for example, you can do things like

code:

var num:int := 2 num := num + 1 put "num is now: ", num

When you click that second button, you know what num was before and you know what button was clicked, so you have enough information to figure out what num should become.

[Wajih]

when you mean the second button, you mean 2 right?

and when you know mean "you know what num was befor and you know what button was clicked" you are talking about 1 and 2 right? so 1 and 12 will equal 12.

but how do i write that into my program? because i already assigned num a value of real and 0.

[Tony]

you can assign num a new value; see the example above.

[Wajih]

see i did that but when i entered 1 and then 2, it erased the one , do you want me to send you my code so you can see the problem?