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tjmoore1993

Fri Apr 03, 2009 12:13 pm


[Help] Real value issue

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Hello, I came across this problem while writting a game in Turing. The problem is not that big of an issue but it causes problems where my "REAL" value is too large because of the math I am using. I am trying to figure out how to limit the numbers after the decimal to only 2 numbers so it displays like this.

%6.39

not
%6.3333333333339

If anyone could be of an assistance that would be great.



NOTE : None of the help given on this will be handed in for class marks. All help given will be studied
till understood and will be rewritten to make sense to me.


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DemonWasp

Fri Apr 03, 2009 12:39 pm


RE:[Help] Real value issue

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This is done by modifying not the value in the variable, but the way you're outputting it.

Specifically, look in the Turing help for the put command. In that entry, look at what a putItem can be:

put realVar, which is just the "expr" part of A. What you really want to do is something like put realVar : * : 2 which includes the ":widthExpn" and ":fractionWidth" parts of A. This tells Turing that you want 4 spaces for the output of realVar and 2 decimal places.

Edit: removed unneeded backslashes.


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tjmoore1993

Fri Apr 03, 2009 1:13 pm


RE:[Help] Real value issue

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I've got it to work but only when I use

put char_calc:2:2

The problem is, is that I am currently using this
    
Font.Draw (realstr (char_calc, 1), 419, 22, exp_text, white)

to display my variable.


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Insectoid

Fri Apr 03, 2009 2:24 pm


RE:[Help] Real value issue

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I would use math. Multiple it by 10, so 3.141592654 would be 314.1292654, then cut off the decimal using the div command. (div does division but cuts off the remainder)

which gives 314. Then divide by 10. Essentially, 

[code]
put 3.141592654*10 div 1 / 10
[/code]

Or, in longer code,
[code]
var pi := 3.141592654
pi := pi * 10
pi := pi div 1
pi := pi / 10
put pi
[/code]

Alternatively, you can use the round() function instead of div. Still have to multiply/divide by 10.


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tjmoore1993

Fri Apr 03, 2009 2:34 pm


Re: RE:[Help] Real value issue

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I would use math. Multiple it by 10, so 3.141592654 would be 314.1292654, then cut off the decimal using the div command. (div does division but cuts off the remainder)

which gives 314. Then divide by 10. Essentially, 



This works instead of 10 though I must use 100 to get a Decimal to the 100th or w/e :D


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Insectoid

Fri Apr 03, 2009 2:43 pm


RE:[Help] Real value issue

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Ah...yes...er...100. Multiply and divide by 100...That's what I meant...


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Dusk Eagle

Fri Apr 03, 2009 2:49 pm


Re: [Help] Real value issue

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To add on to what Insectoid said, you could set a value for the number of decimal places you want:

const DEC_PLACES : int := 3

You then simply multiply/divide by 10**DEC_PLACES [Note: ** indicates exponents]


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blankout

Fri Apr 03, 2009 3:45 pm


Re: [Help] Real value issue

-----------------------------------

Hello, I came across this problem while writting a game in Turing. The problem is not that big of an issue but it causes problems where my "REAL" value is too large because of the math I am using. I am trying to figure out how to limit the numbers after the decimal to only 2 numbers so it displays like this.

%6.39

not
%6.3333333333339

If anyone could be of an assistance that would be great.



NOTE : None of the help given on this will be handed in for class marks. All help given will be studied
till understood and will be rewritten to make sense to me.

Simplest thing is after the equation put :1:2
for example, 
put 1+2:1:2


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tjmoore1993

Fri Apr 03, 2009 4:25 pm


Re: [Help] Real value issue

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THANKS :)