cout ‹‹ "echo: " ‹‹ x ‹‹ "\n";
return s;
}
void error(char* p)
{
cout ‹‹ p ‹‹ "\n";
exit(1);
}
char& string::operator[](int i)
{
if (i‹0 || strlen(p-›s)‹i) error("index out of range");
return p-›s[i];
}
main()
{
string x[100];
int n;
cout ‹‹ "here we go\n";
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];
}
#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);
}
#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";
}
#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",");
}
