I believe you do not want to pass &x1 in the HPFPCONVERT procedures
since it comes in as a pointer.

   {
    float x2;
    short sformat,dformat;
    sformat=1;
    dformat=3;
    HPFPCONVERT( x1,&x2,sformat,dformat);
    printf("parm rec'd = %f\n",x2);
    x2=3.3;
    sformat=3;
    dformat=1;
    HPFPCONVERT(&x2, x1,sformat,dformat);
    return;
   }


+=====================================
 Keven Miller   KC7LYD
 [log in to unmask]   (Salt Lake City, Utah, USA)
+=====================================