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based on an earlier version of the Wolfram Language.
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MathLink C Function

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.