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A weird result about the function "IF"

stillfish over 14 years ago

I run the following line in skill command line :

Skill > if((7.15>7.1+0.05) println("#") println("$"))

and then it shows

"#"
nil

It seems the condition of "IF' was passed, which is not what i expected.

And even i change the syntax to if(greaterp(7.15 7.1+0.05) println("#") println("$"))

it still shows

"#"
nil

Can anyone explain about this result, thanks!

PCB George over 14 years ago

Try something like

if ( ( 7.15 > 7.1+0.05 )

then

println(“#”)

else

println(“$”)
)

~~

George
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fxffxf over 14 years ago

Computers are digital machines while floating point math is analog. A floating point number cannot always be represented exactly in a digital representation. This means when you do any logical comparison of floating point numbers, you must either use an Epsilon value or force a rounding operation.
See the web reference in the documentation for axlGeoEqual.
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stillfish over 14 years ago

Thanks for your reply.
I decide to use the rounding function before comparing two floating value, and it works fine.
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