MathLink Example 2: Sum a list of floating point numbers

This example considers a sum of of floating point numbers.
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addRealList.c
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#include "mathlink.h"
extern double addRealList( void );



double addRealList( void )
{
 int i,n;

 double *list; 

 MLGetReal64List(stdlink,&list,&n);

 double sum=0;
 for(i=0;i<n;i++) sum = sum + list[i];

 
  MLReleaseReal64List(stdlink,list,n);

 return sum;
}



#if WINDOWS_MATHLINK

#if __BORLANDC__
#pragma argsused
#endif

int PASCAL WinMain( HINSTANCE hinstCurrent, HINSTANCE hinstPrevious, LPSTR lpszCmdLine, int nCmdShow)
{

 char  buff[512];
 char FAR * buff_start = buff;

 char FAR * argv[32];
 char FAR * FAR * argv_end = argv + 32;

 hinstPrevious = hinstPrevious; /* suppress warning */

 if( !MLInitializeIcon( hinstCurrent, nCmdShow)) return 1;

 MLScanString( argv, &argv_end, &lpszCmdLine, &buff_start);
 return MLMain( (int)(argv_end - argv), argv);
}

#else

int main(int argc, char* argv[])
{

 return MLMain(argc, argv);
}

#endif

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addRealList.tm
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:Begin:
:Function:       addRealList

:Pattern:        addRealList[ L:{___Real}]
:Arguments:      { L  }
:ArgumentTypes:  { Manual  }
:ReturnType:     Real

:End:

:Evaluate: addRealList::usage = "addRealList[x] gives the sum of the elements on x, given that they are real (double floating numbers)"

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Makefile
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MPREP = /usr/bin/mprep
CXX = /usr/bin/c++

addRealList : addRealListtm.c
 ${CXX} addRealListtm.c addRealList.c -o addRealList -lML64i3 -lm -lpthread -lrt -lstdc++

addRealListtm.c : addRealList.tm
 ${MPREP} addRealList.tm -o $@

clean:

 rm addRealListtm.c
 rm addRealList
 

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addRealList.nb
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link = Install["./addRealList"]

?addRealList

addRealList[{1., 5., 6.}]