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fenhanxue

why 12.7 - 12.4 <> 0.3

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fenhanxue

why.png

why the reslut is 0.29999999999  ???

how can i get 0.3 ?

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nend

I don't know why but I have a sollution, round it.

MsgBox(0, '', round(12.7-12.4, 2))

MsgBox(0, '', round(12.7-12.4, 2))

 

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jchd

That's because neither 12.7 nor 12.4 are representable exactly under IEEE754 double format:

ConsoleWrite(Hex(12.7) & @LF)
ConsoleWrite(Hex(12.4) & @LF)

 


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spudw2k
argumentum

therefore: 

MsgBox(0, '', (( 12.7 * 100 ) - ( 12.4 * 100)) / 100 )

You have to make all real to integers. Once you're done, put it back as real.

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