what dose 1._r8 and 0._r8 mean?

[shine_sea2004@yahoo_com]

Dear all, please input some words for me for these two terms. Thanks a lot, Joyce

 

[rneale]

_r8 sets the precision of the preceding number to a real(8) a 32 bit foat.

 

[shine_sea2004@yahoo_com]

I guess these are the Frotran90 kind type, but I couldn't find them from the F90 manual:))