I'm not very familiar with Fortran, but to me this
looks like just the D notation for DOUBLE PRECISION
type, i.e. 8D0 = 8. 10^0 = 8. etc.
You can disable it using the FortranDoublePrecision option:
Write2["sang.abc", abc = 0.6*(-8 + 12 Log[5 + y]),
abc1 = 1/x^(2/3), FormatType -> FortranForm,
FortranFormatDoublePrecision -> False]
abc = 0.6*(-8. + 12.*Log[5. + y[1.]])
abc1 = x^(-0.6666666666666666)
Is this what you would like to have?
P.S. The bug is actually that Mathematica 10 ignores the option
FortranDoublePrecision, thus always returning the result without D's,
while versions 8 and 9 behave in a correct way. I'll fix that asap.
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