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MLGetReal()
 int MLGetReal(MLINK link, double *x) gets a floating-point number from the MathLink connection specified by link and stores it in x.
If the data on the link corresponds to an integer, MLGetReal() will coerce it to a double before storing it in x.
If the data on the link corresponds to a number outside the range that can be stored in a C double on your computer system, then MLGetReal() will fail, and return 0.
You can get arbitrary-precision real numbers by first using RealDigits to generate lists of digits, then calling MLGetIntegerList().
MLGetReal() is normally equivalent to MLGetDouble().
See The Mathematica Book: Section 2.12.4.
See also: MLGetFloat, MLGetDouble, MLGetRealList.
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