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

MLPutReal64()

int MLPutReal64(MLINK link, double x)
puts the double-precision floating-point number x to the MathLink connection specified by link.
  • MLPutReal64() returns 0 in the event of an error, and a nonzero value otherwise.
  • Use MLError() to retrieve the error code if MLPutReal64() fails.
  • MLPutReal64() is declared in the MathLink header file mathlink.h.
#include "mathlink.h"

/* put the expression Sqrt[2.7] to a link */

void f(MLINK lp)
{
    if(! MLPutFunction(lp, "Sqrt", 1))
        { /* unable to put Sqrt[] to lp */ }

    if(! MLPutReal64(lp, 2.7))
        { /* unable to put 2.7 to lp */ }

    if(! MLEndPacket(lp))
        { /* unable to put the end-of-packet sequence to lp */ }

    if(! MLFlush(lp))
        { /* unable to flush any output buffered in lp */ }
}