b8_3_3.cxx

#include ‹xstream.hxx›

extern void exit(int);

void error(char* s, char* s2)

{

cerr ‹‹ s ‹‹ " " ‹‹ s2 ‹‹ " ";

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",");

}