iostream under Cygwin

G

goberle

I have installed the Cygwin package under WinXP. I am trying to insure
that I have a reasonable development environment, and that things are
working properly, by trying to compile and run the following classic
program.

$ cat hellow.cpp
#include <iostream>

int main (int argc, char *argv[]) {
cout << "Hello, world" << endl;
}


However, when I try to compile, I get

$ g++ hellow.cpp
hellow.cpp: In function `int main(int, char**)':
hellow.cpp:4: error: `cout' undeclared (first use this function)
hellow.cpp:4: error: (Each undeclared identifier is reported only
once for each function it appears in.)
hellow.cpp:4: error: `endl' undeclared (first use this function)

In trying to get more comprehensive infomation, I tried the command
shown below with its output.

If I'm doing something pathetically stupid, do not hesitate to tell me
so --- I've been doing Java for a few years, and I may have forgotten
something really important. :) Thanks in advance for any help.

- Jerry Oberle


$ g++ -v -H hellow.cpp
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs
Configured with: /gcc/gcc-3.3.3-3/configure --verbose --prefix=/usr
--exec-prefi
x=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib
--mandir=/usr/s
hare/man --infodir=/usr/share/info
--enable-languages=c,ada,c++,d,f77,java,objc,
pascal --enable-nls --without-included-gettext --enable-libgcj
--with-system-zli
b --enable-interpreter --enable-threads=posix --enable-java-gc=boehm
--enable-sj
lj-exceptions --disable-version-specific-runtime-libs
--disable-win32-registry
Thread model: posix
gcc version 3.3.3 (cygwin special)
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/cc1plus.exe -quiet -v
-D__GNUC__=3 -D__GN
UC_MINOR__=3 -D__GNUC_PATCHLEVEL__=3 -H -D__CYGWIN32__ -D__CYGWIN__
-Dunix -D__u
nix__ -D__unix -idirafter
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../../../incl
ude/w32api -idirafter
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/../../../../i686-pc-
cygwin/lib/../../include/w32api hellow.cpp -D__GNUG__=3 -quiet
-dumpbase hellow.
cpp -auxbase hellow -version -o /tmp/ccny7uu0.s
GNU C++ version 3.3.3 (cygwin special) (i686-pc-cygwin)
compiled by GNU C version 3.3.3 (cygwin special).
GGC heuristics: --param ggc-min-expand=99 --param
ggc-min-heapsize=130814
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i686-pc-cygwin/include"
ignoring duplicate directory
"/usr/i686-pc-cygwin/lib/../../include/w32api"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/3.3.3
/usr/include/c++/3.3.3/i686-pc-cygwin
/usr/include/c++/3.3.3/backward
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include
/usr/include
/usr/include/w32api
End of search list.
.. /usr/include/c++/3.3.3/iostream
... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/c++config.h
.... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/os_defines.h
... /usr/include/c++/3.3.3/ostream
.... /usr/include/c++/3.3.3/ios
..... /usr/include/c++/3.3.3/iosfwd
...... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/c++locale.h
....... /usr/include/c++/3.3.3/clocale
........ /usr/include/locale.h
......... /usr/include/_ansi.h
.......... /usr/include/newlib.h
.......... /usr/include/sys/config.h
........... /usr/include/machine/ieeefp.h
........... /usr/include/cygwin/config.h
...... /usr/include/c++/3.3.3/cctype
....... /usr/include/ctype.h
...... /usr/include/c++/3.3.3/bits/stringfwd.h
...... /usr/include/c++/3.3.3/bits/fpos.h
....... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/c++io.h
........ /usr/include/c++/3.3.3/cstdio
......... /usr/include/c++/3.3.3/cstddef
.......... /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
......... /usr/include/stdio.h
.......... /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
.......... /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stdarg.h
.......... /usr/include/sys/reent.h
........... /usr/include/sys/_types.h
............ /usr/include/sys/lock.h
............ /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
.......... /usr/include/sys/types.h
........... /usr/include/machine/_types.h
........... /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
........... /usr/include/machine/types.h
........... /usr/include/sys/features.h
........... /usr/include/cygwin/types.h
............ /usr/include/sys/sysmacros.h
............ /usr/include/stdint.h
.......... /usr/include/sys/stdio.h
........ /usr/include/c++/3.3.3/i686-pc-cygwin/bits/gthr.h
......... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/gthr-default.h
.......... /usr/include/pthread.h
........... /usr/include/signal.h
............ /usr/include/sys/signal.h
............. /usr/include/cygwin/signal.h
........... /usr/include/sched.h
............ /usr/include/time.h
............. /usr/include/machine/time.h
............. /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
.......... /usr/include/unistd.h
........... /usr/include/sys/unistd.h
............ /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
............ /usr/include/getopt.h
....... /usr/include/c++/3.3.3/cwchar
........ /usr/include/c++/3.3.3/ctime
........ /usr/include/wchar.h
......... /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
...... /usr/include/c++/3.3.3/bits/functexcept.h
....... /usr/include/c++/3.3.3/exception_defines.h
..... /usr/include/c++/3.3.3/exception
..... /usr/include/c++/3.3.3/bits/char_traits.h
...... /usr/include/c++/3.3.3/cstring
....... /usr/include/string.h
........ /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
........ /usr/include/sys/string.h
..... /usr/include/c++/3.3.3/bits/localefwd.h
...... /usr/include/c++/3.3.3/bits/functexcept.h
....... /usr/include/c++/3.3.3/exception_defines.h
..... /usr/include/c++/3.3.3/bits/ios_base.h
...... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/atomicity.h
...... /usr/include/c++/3.3.3/bits/locale_classes.h
....... /usr/include/c++/3.3.3/string
........ /usr/include/c++/3.3.3/memory
......... /usr/include/c++/3.3.3/bits/stl_algobase.h
.......... /usr/include/c++/3.3.3/climits
........... /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/limits.h
............ /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/syslimits.h
............. /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/limits.h
.............. /usr/include/limits.h
.......... /usr/include/c++/3.3.3/cstdlib
........... /usr/include/stdlib.h
............ /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
............ /usr/include/machine/stdlib.h
............ /usr/include/alloca.h
.......... /usr/include/c++/3.3.3/new
.......... /usr/include/c++/3.3.3/bits/stl_pair.h
.......... /usr/include/c++/3.3.3/bits/type_traits.h
.......... /usr/include/c++/3.3.3/bits/stl_iterator_base_types.h
.......... /usr/include/c++/3.3.3/bits/stl_iterator_base_funcs.h
........... /usr/include/c++/3.3.3/bits/concept_check.h
.......... /usr/include/c++/3.3.3/bits/stl_iterator.h
......... /usr/include/c++/3.3.3/bits/stl_alloc.h
.......... /usr/include/c++/3.3.3/bits/functexcept.h
........... /usr/include/c++/3.3.3/exception_defines.h
.......... /usr/include/c++/3.3.3/bits/stl_threads.h
......... /usr/include/c++/3.3.3/bits/stl_construct.h
......... /usr/include/c++/3.3.3/bits/stl_uninitialized.h
......... /usr/include/c++/3.3.3/bits/stl_raw_storage_iter.h
........ /usr/include/c++/3.3.3/bits/stl_function.h
........ /usr/include/c++/3.3.3/bits/basic_string.h
........ /usr/include/c++/3.3.3/algorithm
......... /usr/include/c++/3.3.3/bits/stl_algo.h
.......... /usr/include/c++/3.3.3/bits/stl_heap.h
.......... /usr/include/c++/3.3.3/bits/stl_tempbuf.h
........ /usr/include/c++/3.3.3/bits/basic_string.tcc
..... /usr/include/c++/3.3.3/streambuf
...... /usr/include/c++/3.3.3/bits/streambuf.tcc
..... /usr/include/c++/3.3.3/bits/basic_ios.h
...... /usr/include/c++/3.3.3/bits/streambuf_iterator.h
...... /usr/include/c++/3.3.3/bits/locale_facets.h
....... /usr/include/c++/3.3.3/cwctype
........ /usr/include/wctype.h
......... /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/stddef.h
....... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/ctype_base.h
....... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/ctype_inline.h
....... /usr/include/c++/3.3.3/bits/codecvt.h
....... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/time_members.h
....... /usr/include/c++/3.3.3/i686-pc-cygwin/bits/messages_members.h
...... /usr/include/c++/3.3.3/bits/basic_ios.tcc
.... /usr/include/c++/3.3.3/bits/ostream.tcc
..... /usr/include/c++/3.3.3/locale
...... /usr/include/c++/3.3.3/bits/locale_facets.tcc
....... /usr/include/c++/3.3.3/cerrno
........ /usr/include/errno.h
......... /usr/include/sys/errno.h
....... /usr/include/c++/3.3.3/cmath
........ /usr/include/math.h
......... /usr/include/machine/ieeefp.h
........ /usr/include/c++/3.3.3/bits/cmath.tcc
....... /usr/include/c++/3.3.3/limits
....... /usr/include/c++/3.3.3/typeinfo
... /usr/include/c++/3.3.3/istream
.... /usr/include/c++/3.3.3/bits/istream.tcc
hellow.cpp: In function `int main(int, char**)':
hellow.cpp:4: error: `cout' undeclared (first use this function)
hellow.cpp:4: error: (Each undeclared identifier is reported only once
for each

function it appears in.)
hellow.cpp:4: error: `endl' undeclared (first use this function)
Multiple include guards may be useful for:
/usr/include/c++/3.3.3/bits/istream.tcc
/usr/include/c++/3.3.3/bits/ostream.tcc
/usr/include/c++/3.3.3/i686-pc-cygwin/bits/ctype_base.h
/usr/include/c++/3.3.3/i686-pc-cygwin/bits/ctype_inline.h
/usr/include/c++/3.3.3/i686-pc-cygwin/bits/messages_members.h
/usr/include/c++/3.3.3/i686-pc-cygwin/bits/time_members.h
/usr/include/cygwin/types.h
/usr/include/getopt.h
/usr/include/pthread.h
/usr/include/sys/string.h
/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/include/syslimits.h

#
perl -e \
'printf "mailto%c%s%c%s%cjpmchase%ccom%c", 58, "Gerard", 46, "Oberle",
64,
46, 10;' -e 'printf "mailto%c%c%s%cearthlink%cnet%c", 58, 103,
"oberle", 64, 46, 10;'
 
L

Larry I Smith

I have installed the Cygwin package under WinXP. I am trying to insure
that I have a reasonable development environment, and that things are
working properly, by trying to compile and run the following classic
program.

$ cat hellow.cpp
#include <iostream>

int main (int argc, char *argv[]) {
//cout << "Hello, world" << endl;
Click to expand...


std::cout << "Hello, world" << std::endl;
}


However, when I try to compile, I get

$ g++ hellow.cpp
hellow.cpp: In function `int main(int, char**)':
hellow.cpp:4: error: `cout' undeclared (first use this function)
hellow.cpp:4: error: (Each undeclared identifier is reported only
once for each function it appears in.)
hellow.cpp:4: error: `endl' undeclared (first use this function)

In trying to get more comprehensive infomation, I tried the command
shown below with its output.

If I'm doing something pathetically stupid, do not hesitate to tell me
so --- I've been doing Java for a few years, and I may have forgotten
something really important. :) Thanks in advance for any help.

- Jerry Oberle
Click to expand...

[snip]

Things from the standard headers are in the 'std' namespace.
If you're not familiar with this, read up on it.

See my corrected line in your code above.

Larry
 
P

Pelle Beckman

Or you could do

using namespace std;

int main (...) {
cout << "Hello, world" << endl;
}

But, as Larry said, freshen up on namespaces.
Are there such in Java?

-- Pelle

Larry I Smith skrev:
I have installed the Cygwin package under WinXP. I am trying to insure
that I have a reasonable development environment, and that things are
working properly, by trying to compile and run the following classic
program.

$ cat hellow.cpp
#include <iostream>

int main (int argc, char *argv[]) {
//cout << "Hello, world" << endl;
Click to expand...



std::cout << "Hello, world" << std::endl;

}


However, when I try to compile, I get

$ g++ hellow.cpp
hellow.cpp: In function `int main(int, char**)':
hellow.cpp:4: error: `cout' undeclared (first use this function)
hellow.cpp:4: error: (Each undeclared identifier is reported only
once for each function it appears in.)
hellow.cpp:4: error: `endl' undeclared (first use this function)

In trying to get more comprehensive infomation, I tried the command
shown below with its output.

If I'm doing something pathetically stupid, do not hesitate to tell me
so --- I've been doing Java for a few years, and I may have forgotten
something really important. :) Thanks in advance for any help.

- Jerry Oberle
Click to expand...


[snip]

Things from the standard headers are in the 'std' namespace.
If you're not familiar with this, read up on it.

See my corrected line in your code above.

Larry
Click to expand...
 
L

Larry I Smith

Pelle said:
Or you could do

using namespace std;

int main (...) {
cout << "Hello, world" << endl;
}

But, as Larry said, freshen up on namespaces.
Are there such in Java?

-- Pelle
Click to expand...

Be careful. Blanket use of "using namespace std;"
in large systems can get you into trouble.
Remember that one of the reasons for namespaces is to
prevent hard-to-track-down bugs due to name clashes.
It's ok is a trivial example like this program, but
should not be used indiscriminately.

Regards,
Larry
 
B

benben

And this means putting the using directive in the main function is a better
option:

#include <iostream>

int main(int argc, char* argv[])
{
using namespace std;
cout << "Hello again!" << end;
}

Or, even better, use a "using-declarative":

#include <iostream>

int main(int argc, char* argv[])
{
using std::cout;
using std::endl;

cout << "Well, I know, hello again..." << endl;
}

regards,
ben
 

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