Decimals and Negatives

[Crazy]

We have to make a calculator on turing I have everything else I am just having a little trouble with AC, decimal, and the negative part of the programming. The AC is working only for the fist number and only when I press an operator. The decimals and negatives are confusing. If someone can help that would be great!

[DanielG]

negative shouldn't be a problem, all you need is a boolean to check if negative, if it is, when adding a number add the negative of the number clicked, if not add the positive.

decimals is a bit more complex, you need a boolean variable (again) to store whether the dot has been placed yet or if it hasn't, you also need an integer depth (discussed later), if it hasn't you obviously multiply your current value by 10 then add the value, if it has been placed, then you have to divide the number by 10 as many times as the depth then add it to the number (without multiplying by 10)

hope this helps.

[Crazy]

that helps

can you give me an example of how this would look?for both the decimal and negative

[DanielG]

for negative, you have the number -100 stored, which you know is a negative, so when clicking on say 6 on the calculator, it would mutliply -100 by 10, giving -1000, then add -6, resulting in -1006, which is what should happen on a calculator.

for decimals, if '.' has not been pressed on, then do as above (only with positives assuming it is positive). if it has, then use the depth to see how much you divide by. for example, you have 1.31 stored, the depth would be 1000, since that is what you need to divide by, so when for example 3 is pressed, the number becomes 1.31+3/1000, afterwards, remember to multiply depth by 10 after opearation (earler I said take 10^depth, but this is easier)

[Crazy]

thank you it actually helps
lol
I understand somewat

[DanielG]

np

[Crazy]

Quote:

if op= "4" then %negative
drawfillbox (100, 200, 350, 365, black)
num1 *10+num2
end if

i made the negative sign into op 4 the drawfillbox is my screen

does that look right?

I'm sory if im bothering you but imnew to turing and we didnt learn alot in class.

[DanielG]

wait, can you properly explain what the assignment is? I want to be sure I haven't explained to you something that is completely unrelated.

[Crazy]

I think you have explained it properly I'm not getting it. We have to make a calculator the basic functions +,-,*, and /. WIth those functions I am also including negatives, decimals, and an ac button.

[DanielG]

how do you get the input? what is ac again?

[Crazy]

we used the buttonwait so the users click on the numbers and the show on the screen.

AC- all clear like we see on calculators

This is how im doing the operations...

Turing:

if op = "1" then                         %+    drawfillbox (75, 390, 350, 365, black)     Font.Draw (intstr (-num1 + num2), 345 - 10 * length (intstr (num1 + num2)), 370, font1, white) elsif op = "2" then                     %-     drawfillbox (75, 390, 350, 365, black)          Font.Draw (intstr (num1 - num2), 345 - 10 * length (intstr (num1 - num2)), 370, font1, white) elsif op = "3" then                     %(*)     drawfillbox (75, 390, 350, 365, black)          Font.Draw (intstr (num1 * num2), 345 - 10 * length (intstr (num1 * num2)), 370, font1, white) elsif op = "4" then                     %(/)     drawfillbox (75, 390, 350, 365, black)          Font.Draw (intstr (floor (num1 / num2)), 345 - 10 * length (intstr (floor (num1 / num2))), 370, font1, white)

Not sure about this one

Turing:

elsif op = "5"  then %negative (-)   drawfillbox (75, 390, 350, 365, black)     Font.Draw (intstr (-num1)  (-num2 ), 345 - 10 * length (intstr  (-num1) (-num2)), 370, font1, white)

Mod Edit: Remember to use syntax tags! Thanks

code:

[syntax="turing"]Code Here[/syntax]

[Crazy]

lol i got the negative to work thanks for ur help and the users on chat

So for the decimals as u said before instead of multiplying it by 10 we would divde number by 10?

[deltatux]

I don't remember Turing too much, but if you can set it to a double (haven't used Turing since I ditched it in grade 9 ... or 4 yrs ago) you can store decimal numbers.

in Java, I would do something like this:

code:

double dblDecimal = 0;

I think it's called real numbers in Turing.

deltatux

[Crazy]

ye it is real numbers, i dont know where to go on form there

[DanielG]

you need to store how many numbers after the decimal point you have placed, and divide by a power of 10 accordingly, or even better, whenever adding a number, multiply your division constant by 10.