03-06-2003
Couldn't compile the simple "Hello World"
So, this is my first C++ program under linux. My OS is Red Hat 8.0, and my codes are like following:
$vi hello.cpp
#include <iostream>
using namespace std;
int main()
{
cout << "Hello World!" << endl;
return 0;
}
$ g++ -o hello hello.cpp
the error message are:
hello.cpp: In function `int main()':
hello.cpp:4: `cout' undeclared (first use this function)
hello.cpp:4: (Each undeclared identifier is reported only once for each
function it appears in.)
hello.cpp:4: `endl' undeclared (first use this function)
It could run under M$ with VS 6.0. Can someone tell me what I did wrong here? Thanx.
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LEARN ABOUT CENTOS
rhn_check
RHN_CHECK(8) Red Hat, Inc. RHN_CHECK(8)
NAME
rhn_check - Check for and execute queued actions on RHN.
SYNOPSIS
rhn_check [options]
DESCRIPTION
rhn_check is a client program that connects to "Spacewalk Server", "Red Hat Satellite" or "Red Hat Network Classic" and receives queued
actions for this particular system. After receiving the actions, rhn_check will then process them, and return the results to Spacewalk.
OPTIONS
-v, --verbose
Increase the debugging output.
--proxy=PROXY
Specify an http proxy to use.
--proxyUser=PROXYUSER
Specify a username to use for an authenticated proxy. This option must be used in conjunction with proxyPassword.
--proxyPassword=PROXYPASSWORD
Specify a password to use for an authenticated proxy. This option must be used in conjunction with proxyUser.
--version
Show the program's version number and exit.
-h, --help
Show a help message and exit.
FILES
/etc/sysconfig/rhn/systemid
The digital server ID for this machine if the system has been registered onto "Spacewalk Server", "Red Hat Satellite" or "Red Hat
Network Classic". This file does not exist otherwise.
/etc/sysconfig/rhn/up2date
The common configuration file used by RHN client programs.
SEE ALSO
rhn_register(8), rhnreg_ks(8), rhnsd(8), rhn-profile-sync(8), rhnplugin(8), up2date(5).
AUTHORS
See the AUTHORS file included with this software.
This manual page was written by James Bowes <jbowes@redhat.com>
BUGS
Report bugs to <http://bugzilla.redhat.com>.
COPYRIGHT
Copyright (C) 1999-2010 Red Hat, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
Linux 2010 August 30 RHN_CHECK(8)