compound.frink

View or download compound.frink in plain text format


// Test program to determine the mass of a chemical compound.

use elements.frink

// Returns the mass of a molecule of a chemical compound like "H2SO4" or "NaCl"
// To get the molar mass, multiply the results by "avogadro".
mass[compound] :=
{
   mass = 0 amu
   // The regular expression below breaks into pairs of element names
   // and their count.
   for [elem,count] = compound =~ %r/([A-Z][a-z]{0,2})(\d*)/g
   {
      if (! count)
         count = 1
      else
         count = eval[count]
      e = Element.getByName[elem]

      if (e == undef)
         return "Error:  Unknown element $elem.  Note that case is important!"
      else
         mass = mass + e.atomicMass * count
   }
   return mass
}


View or download compound.frink in plain text format


This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen was born 17591 days, 17 hours, 45 minutes ago.