//  Mass class implementation
//  --------------------------

//  To allow this class to be used independently, funtions that
//  interact with other physical quantity classes are not defined 
//  here.  See Newton.cpp for some of them.

#include "global.hpp"
#include "Mass.hpp"

 Mass& Mass::operator+=(MASS rs)   {value+=rs.value; return *this;}
 Mass& Mass::operator-=(MASS rs)   {value-=rs.value; return *this;}
 Mass& Mass::operator*=(DOUBLE rs) {value*=rs;       return *this;} 
 Mass& Mass::operator/=(DOUBLE rs) {value/=rs;       return *this;} 
    

 ostream& operator<<(ostream& ls, MASS rs)  
  {return ls << rs.grams() << " grams";}