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    <p>It means "double precision" and the +0 means 10 to the zeroth power (zero is the exponent).</p> <p>Here's a quote from <a href="http://www.obliquity.org/computer/fortran/datatype.html" rel="noreferrer">first reference</a> I could find:</p> <blockquote> <p>A number stored in a computer is limited in magnitude and precision. The limits depend on the particular computer. Thus, a REAL number has only a certain number of significant digits. If more significant digits are required for a calculation, then DOUBLE PRECISION numbers must be used. A DOUBLE PRECISION constant is written in the same exponential form as a single precision REAL constant except with a D instead of an E separating the mantissa from the exponent.</p> </blockquote> <p>And here is a quote from a better reference, <a href="http://www.fortran.com/F77_std/rjcnf0001-sh-4.html#sh-4.2.1" rel="noreferrer">www.fortran.com</a>, specifically the F77 standard.</p> <blockquote> <p>4.5.2 Double Precision Constant.</p> <p>The forms of a double precision constant are: </p> <ol> <li>Basic real constant followed by a double precision exponent </li> <li>Integer constant followed by a double precision exponent</li> </ol> <p>The value of a double precision constant is the product of the constant that precedes the D and the power of ten indicated by the integer following the D. The integer constant part of form (2) may be written with more digits than a processor will use to approximate the value of the constant.</p> </blockquote>
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    1. POpostfix 'd+0' in Fortran real literal expressions
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    1. COo__O wow thanks for the immediate reply, I was looking for chat rooms/channels for Fortran newbies but you answered my question even before I had time to decide which IRC client to use!!
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