Wrong math (solved)

[zarsoft]

PRINT SIN 1
Gives: 0.841461181640625 (wrong)

LET v = 1
PRINT SIN v
Gives: 0.84147098 (right)

[boriel]

They are actually the same value. It's a matter of precission.
SIN 1 is being calculated directly by the compiler in compiling time.
SIN(1) is aprox 0.8414709848078965

The 2nd case is computed in runtime, using the ROM calculator.

I guess this is due to a bug in precision converting from PC to ZX Spectrum 5 bytes format.
Will investigate this and keep you posted.

Thanks

[boriel]

In effect, is a silly bug: for some reason, the compiler is convertig SIN 1 to Fixed before printing it.
You can (for the moment) workaround it with:

Code:

PRINT CAST(Float, SIN 1)

[boriel]

Ok. Download this new beta, that fixes this issue:
http://www.boriel.com/files/zxb/zxbasic-...ta1.tar.gz
http://www.boriel.com/files/zxb/zxbasic-...-beta1.zip
http://www.boriel.com/files/zxb/zxbasic-...-win32.zip
http://www.boriel.com/files/zxb/zxbasic-...x64.tar.gz
http://www.boriel.com/files/zxb/zxbasic-...cos.tar.gz

[zarsoft]

Thanks