#include <library.h>

struct wealth
{ double gAu;    /* grams of gold */
  double ozAg;   /* ounces of silver */
  double kC;     /* carats of diamonds */
  int pearls     /* number of pearls */ };

// remember the compulsory ; at the end.

void print(wealth w)
{ cout << w.gAu << " g gold + " << w.ozAg << " oz silver + "
       << w.kC << " kt diamond + " << w.pearls << " pearls\n"; }

void main()
{ wealth mine;
  mine.gAu = 123;
  mine.ozAg = 11;
  mine.kC = 0.01;
  mine.pearls = 0;
  cout << "I've got ";
  print(mine);
  ... }

// for convenience:

void set(wealth & w, double a, double b, double c, int d)
{ w.gAu = a;
  w.ozAg = b;
  w.kC = c;
  w.pearls = d; }

void main()
{ wealth jills;
  set(jills, 17, 8, 3.5, 9);
  cout << "jill's got ";
  print(jills);
  ... }

// also for convenience

wealth makewealth(double a, double b, double c, int d)
{ wealth w;
  set(w, a, b, c, d);
  return n; }

void main()
{ wealth joes;
  ...
  joes = makewealth(0, 0.5, 0, 0);
  cout << "joe's got ";
  print(joes);
  ... }

// arithmetic operations can be made too, for example

wealth add(wealth x, wealth y)
{ return makewealth(x.gAu + y.gAu, x.ozAg + y.ozAg, x.kC + y.kC, x.pearls + y.pearls); }

// or

void addto(wealth & x, wealth y)
{ x.gAu = x.gAu + y.gAu;
  x.ozAg = x.ozAg + y.ozAg;
  x.kC = x.kC + y.kC;
  x.pearls = x.pearls + y.pearls; }

// how to make a robber

void rob(wealth & robber, wealth & victim)
{ addto(robber, victim);
  set(victim, 0, 0, 0, 0); }