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General Coding and Design =>
Calculator Programming
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Darth Android
DragonOS Dev Team
Bandwidth Hog
Joined: 31 May 2003
Posts: 2104
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 Posted: 22 Dec 2004 07:38:34 pm Post subject: |
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heres the code:
Code:
#include <iostream>
#include <iomanip>
int main()
{
double x;
cout << "Enter a number: " << endl;
cin >> x;
cout << "The number you entered is " << x << " and its double is " << x * 2 << "." << endl;
return 0;
}
heres the compiler output:
Quote: dandroid@localhost:~$ gcc C++/121604.cpp
C++/121604.cpp: In function `int main()':
C++/121604.cpp:8: error: `cout' undeclared (first use this function)
C++/121604.cpp:8: error: (Each undeclared identifier is reported only once for
each function it appears in.)
C++/121604.cpp:8: error: `endl' undeclared (first use this function)
C++/121604.cpp:9: error: `cin' undeclared (first use this function)
it looks like its not including the header file iostream correctly or at all.
here's my gcc version info:
Quote: dandroid@localhost:~$ gcc -v
Reading specs from /usr/lib/gcc-lib/i486-linux/3.3.4/specs
Configured with: ../src/configure -v --enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib --enable-nls --without-included-gettext --enable-__cxa_atexit --enable-clocale=gnu --enable-debug --enable-java-gc=boehm --enable-java-awt=xlib --enable-objc-gc i486-linux
Thread model: posix
gcc version 3.3.4 (Debian 1:3.3.4-9)
any ideas/help? |
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Arcane Wizard
`semi-hippie`
Super Elite (Last Title)
Joined: 02 Jun 2003
Posts: 8993
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| Posted: 23 Dec 2004 04:45:20 am Post subject: |
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No file extensions?
Also, you might as well make main() void for such a simple program and when you're just going to return 0 anyway.
Last edited by Guest on 23 Dec 2004 04:46:39 am; edited 1 time in total |
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alexrudd
pm me if you read this
Bandwidth Hog
Joined: 06 Oct 2004
Posts: 2335
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| Posted: 23 Dec 2004 12:42:40 pm Post subject: |
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| How old is your compiler? I know older versions need you to use "#include <iostream.h>", the .h being necessary for some reason. Maybe check your documentation. |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 23 Dec 2004 03:37:42 pm Post subject: |
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| necessary "for some reason"?!?!?! it's the most important part! there is a little file named "iostream.h", for a good reason. there is no file named "iostream". |
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Arcane Wizard
`semi-hippie`
Super Elite (Last Title)
Joined: 02 Jun 2003
Posts: 8993
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| Posted: 23 Dec 2004 03:57:07 pm Post subject: |
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Win32/MSDOS doesn't mind, Linux does.
Of course the compiler can check if you mean file or file.h, but I consider that to be a dumb feature for a compiler. |
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JoeImp
Enlightened
Active Member
Joined: 24 May 2003
Posts: 747
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| Posted: 23 Dec 2004 04:20:28 pm Post subject: |
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The proper way to use iostream is:
#include <iostream>
using namespace std;
void main()
{
cout << "bla bla bla";
}
That is the correct, more accepted way. Of course, you can always put the .h on the end at not put the 'using namespace', but most people don't like that now-adays. Like if I post a program I made somewhere that includes iostream.h, people yell at me. Look it up on google
Imp |
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alexrudd
pm me if you read this
Bandwidth Hog
Joined: 06 Oct 2004
Posts: 2335
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| Posted: 23 Dec 2004 05:35:14 pm Post subject: |
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Yes, I know it is necessary, but only for older compilers. I don't know why they changed it, so I said "for some reason."
Please excuse my ignorance, my C++ class is really basic and we use compilers that are 10 years out of date.  |
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JoeImp
Enlightened
Active Member
Joined: 24 May 2003
Posts: 747
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| Posted: 23 Dec 2004 09:23:28 pm Post subject: |
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I wasn't responding to anyone's posts, just saying what I know. 
Imp |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 24 Dec 2004 12:54:07 pm Post subject: |
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alexrudd wrote: Please excuse my ignorance, my C++ class is really basic and we use compilers that are 10 years out of date.
Only 10? That's recent. |
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alexrudd
pm me if you read this
Bandwidth Hog
Joined: 06 Oct 2004
Posts: 2335
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| Posted: 24 Dec 2004 03:11:29 pm Post subject: |
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@Sir Robin - then why does it says "style of function definition now obsolete" when we make functions? :P
@Darth Android - Still having problems? Or have any of the many things we have said done anything?  |
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Arcane Wizard
`semi-hippie`
Super Elite (Last Title)
Joined: 02 Jun 2003
Posts: 8993
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| Posted: 24 Dec 2004 04:54:24 pm Post subject: |
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alexrudd wrote: @Sir Robin - then why does it says "style of function definition now obsolete" when we make functions?
Wouldn't only new compilers say old definitions are obsolete? |
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