What does mean 10.D00 in Fortran?

Question

I have to convert some code from Fortran so doesn't know how what this statement means:

var1 = 10.D00

Can someone explain me what it means?

Answer 1

It's just 10.0 in scientific notation with double precision (that's what the D stands for).

See: http://www.fortran.com/F77_std/rjcnf0001-sh-4.html#sh-4.2.1:

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4.5.1 Double Precision Exponent.

The form of a double precision exponent is the letter D followed by an optionally signed integer constant. A double precision exponent denotes a power of ten. Note that the form and interpretation of a double precision exponent are identical to those of a real exponent, except that the letter D is used instead of the letter E.

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