Справочное руководство по C++ — страница 41 из 41

 for (n = 0; cin››x[n]; n++) {
  string y;
  if (n==100) error("too many strings");
  cout ‹‹ (y = x[n]);
  if (y=="done") break;
 }
 cout ‹‹ "here we go back again\n";
 for (int i=n-1; 0‹=i; i--) cout ‹‹ x[i];
}

b7_2_8.cxx

#include ‹stream.hxx›

struct employee {
 friend class manager;
 employee* next;
 char* name;
 short department;
 virtual void print();
};

struct manager: employee {
 employee* group;
 short level;
 void print();
};

void employee::print()
{
 cout ‹‹ name ‹‹ "\t" ‹‹ department ‹‹ "\n";
}

void manager::print()
{
 employee::print();
 cout ‹‹ "\tlevel " ‹‹ level ‹‹ "\n";
}

void f(employee* ll)
{
 for (; ll; ll=ll-›next) ll-›print();
}

main ()
{
 employee e;
 e.name = "J. Brown";
 e.department = 1234;
 e.next = 0;
 manager m; 
 m.name = "J. Smith";
 m.department = 1234;
 m.level = 2;
 m.next = &e;
 f(&m);
}

b7_7.cxx

#include ‹stream.hxx›

struct base { base(); };

struct derived: base { derived(); };

base:: base()
{
 cout ‹‹ "\tbase 1: this=" ‹‹ long(this) ‹‹ "\n";
 if (this == 0) this = (base*)27;
 cout ‹‹ "\tbase 2: this=" ‹‹ long(this) ‹‹ "\n";
}

derived::derived()
{
 cout ‹‹ "\tderived 1: this=" ‹‹ long(this) ‹‹ "\n";
 if (this == 0) this = (derived*)43;
 cout ‹‹ "\tderived 2: this=" ‹‹ long(this) ‹‹ "\n";
}

main()
{
 cout ‹‹ "base b;\n";
 base b;
 cout ‹‹ "new base;\n";
 new base;
 cout ‹‹ "derived d;\n";
 derived d;
 cout ‹‹ "new derived;\n";
 new derived;
 cout ‹‹ "new derived;\n";
 new derived;
 cout ‹‹ "at the end\n";
}

b8_3_3.cxx

#include ‹xstream.hxx›

extern void exit(int);

void error(char* s, char* s2)
{
 cerr ‹‹ s ‹‹ " " ‹‹ s2 ‹‹ "\n";
 exit(1);
}

main(int argc, char* argv[])
{
 if (argc != 3) error ("wrong number of arguments",");

 filebuf f1;
 if (f1.open(argv[1],input) == 0)
  error("cannot open input file",argv[1]);
 istream from(&f1);

 filebuf f2;
 if (f2.open(argv[2],output) == 0)
  error("cannot open input file",argv[2]);
 ostream to(&f2);

 char ch;
 while (from.get(ch)) to.put(ch);

 if (!from.eof() || to.bad())
  error("something strange happened",");
}