Programming in C++, 2nd Edition

680 Applications with Files

if (argc<3 )

{

cout<<“Insufficient Arguments”;

exit(1);

}

in.open(argv[1],ios::in | ios::nocreate);

if (in.fail())

{

cout<<“\nFile Not Found”;

exit(0);

}

in.close();

out.open(argv[2],ios::in | ios::nocreate);

if (out.fail())

{ rename(argv[1],argv[2]); }

else

cout<<“\nDuplicate file name or file is in use.”;

return 0;

}

Explanation: In the above program, the main() receives two file names. The existence of the

file can be checked by opening it in the read mode. If the file does not exist, the program is termi-

nated. On the other hand, if the second file exists, the renaming operation cannot be performed. ...