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OrbWorks Community Forum • View topic - Is this a bug in Pocket C?

Is this a bug in Pocket C?

Discuss PocketC for Palm OS (including Desktop Edition)

Postby Velvis on Mon Apr 16, 2001 12:04 pm

Heres the code:
float z,x,y;

main(){
x=1.03;
y=1.00;
z=x-y;
alert(z);
}

When I use the numbers 1.03 & 1.0, z ends up being 2.99999... instead of .03

If I plug in larger numbers it works fine, giving the proper result of the subtraction.

Is this a bug or am I not doing something right?
Velvis
 
Posts: 226
Joined: Mon Dec 11, 2000 2:32 am

Postby artosoft on Mon Apr 16, 2001 1:02 pm

Actual result is 2.9999971e-02.

That's scientific output equal to 0.029999971.

You must use :

alert(format(z,2));//give output 0.03
or
alert(format(z,4));//give output 0.0300

Best regards, Dian Suharto.
artosoft
 
Posts: 207
Joined: Sat Dec 09, 2000 12:57 am
Location: Indonesia

Postby Velvis on Tue Apr 17, 2001 11:54 pm

Thanks, long forgotten math....
Velvis
 
Posts: 226
Joined: Mon Dec 11, 2000 2:32 am

Postby stephane on Wed Apr 18, 2001 12:08 am

Funny, I would have thought that you would simply get a result of "0.03".

Interestingly, I tried the same operation in QuickBasic and got the same result (scientific notation). I guess this is common behavior when using floating point arithmetic with any language?


St?ɬ©phane
Stéphane
stephane
 
Posts: 71
Joined: Fri Jan 12, 2001 3:16 am
Location: Canada


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