Programming Forums > Application Development > C++

Pizentios · May 18th, 2004, 9:36 AM

Hey,

i havn't programmed in c++ for a while so last night i desided to just fool around for a while. First i just started making a simple hello world programm to get back in the swing of things. Here's the code...just wait i am getting to the question bare with me.

(Toggle Plain Text)

#include <iostream>

int main()
{
    cout << "Hello World" << endl;
    return 0;
}

Anyways, it looks alright....right? When i try to compile it useing the command:

Quote:

gcc -o Hey hello.C

it gives me this error:

Quote:

hello.C: In function `int main()':
hello.C:5: `cout' undeclared (first use this function)
hello.C:5: (Each undeclared identifier is reported only once for each function
it appears in.)
hello.C:5: `endl' undeclared (first use this function)

It just doesn't make any sence to me. I even went back to my old books and searched the net and everything i've read says iostream is good to go. I even looked in my iostream file in the c++ include dir and everything looks fine. I am running Slackware 9.1 if that is any help. Can somebody tell me what the hell is happening. Yes, i know the error could be caused by my lack of memory reguarding c++, since i havn't programmed in c++ in around three years...sad isn't it? Thanks for the help in advance.

-Pizentios

big_k105 · May 18th, 2004, 9:52 AM

the problem that i am seeing is that you are trying to compile a c program but you are writing a c++ program you woudlnt use gcc you would use something else i cant think of it off the top of my head if i come up with it later i will post it. and another thing you mite want to save the file as .cpp that mite help you out there too.

edit. well i think the command for compiling a c++ program would be g++ but im not sure i didnt run the command to check but try that out and see what you get

good luck

Pizentios · May 18th, 2004, 10:25 AM

Hey,

I tryed the command:

Quote:

g++ -o Hey hello.C

and got the same error. So i mv'd the file to hello.cpp and tryed the g++ command again. Same results. This is confusing...but i guess that's what i guess for forgetting how to programm in c++. Thanks for your help so far.

-Pizentios

big_k105 · May 18th, 2004, 12:08 PM

well i got it to work by adding a bit of code all i added was this

(Toggle Plain Text)

using namespace std;

im not sure what it does cause i dont know c++ but it made the program work and compile

so this is the code you would have

(Toggle Plain Text)

#include <iostream>
using namespace std;

int main()
{
    cout << "Hello World" << endl;
    return 0;
}

and then run

(Toggle Plain Text)

g++ -o test test.cpp

those are what i called the file

good luck

Pizentios · May 18th, 2004, 12:10 PM

Thanks for the help. I don't ever remember using that in c++. oh, well it works so i an't going to complain. Thanks once again.

-Pizentios

big_k105 · May 18th, 2004, 12:14 PM

no problem

i love to help.

even when i dont know the language

lordnothing · May 18th, 2004, 4:27 PM

the "using namespace std;" line is part of the C++ standard... the old way is still seen, but very much deprecated... you should pick up a book on standard C++ just to get up to speed on what they've adopted/changed/added to C++ during the standardization process.

Pizentios · May 18th, 2004, 4:59 PM

cool, i didn't know that. thanks for the info. know any good sites with this info on them? Just so i don't have to spend money.

lordnothing · May 20th, 2004, 6:41 PM

not off the top of my head... i got that from Herbert Schildt's "Teach Yourself C++"

Stormhawk · Jun 14th, 2004, 6:04 AM

I'd recommend Bjarne Stroustrup's "The C++ Programming Language, 3rd Edition" for an in-depth, up-to-date and comprehensive guide to C++. I used it both to learn the advanced features (I already knew the basics of C++ before buying that book) and as a reference to any part of the language you care to mention. It contains a few chapters on the STL containers and algorithms, with a more indepth look at strings and streams. In all, a very useful book.

http://www.amazon.com/exec/obidos/tg/detai...=glance&s=books

May 18th, 2004, 9:52 AM	#2
big_k105 PFO Founder Join Date: Mar 2004 Location: Fargo, ND Posts: 1,630 Rep Power: 10	the problem that i am seeing is that you are trying to compile a c program but you are writing a c++ program you woudlnt use gcc you would use something else i cant think of it off the top of my head if i come up with it later i will post it. and another thing you mite want to save the file as .cpp that mite help you out there too. edit. well i think the command for compiling a c++ program would be g++ but im not sure i didnt run the command to check but try that out and see what you get good luck __________________ BIG K aka Kyle Programming Forums Kyle K Online Please do not PM or email me programming questions. Post them in the forums instead.

May 18th, 2004, 12:08 PM	#4
big_k105 PFO Founder Join Date: Mar 2004 Location: Fargo, ND Posts: 1,630 Rep Power: 10	well i got it to work by adding a bit of code all i added was this (Toggle Plain Text) using namespace std; using namespace std; im not sure what it does cause i dont know c++ but it made the program work and compile so this is the code you would have (Toggle Plain Text) #include <iostream> using namespace std; int main() { cout << "Hello World" << endl; return 0; } #include <iostream> using namespace std; int main() { cout << "Hello World" << endl; return 0; } and then run (Toggle Plain Text) g++ -o test test.cpp g++ -o test test.cpp those are what i called the file good luck __________________ BIG K aka Kyle Programming Forums Kyle K Online Please do not PM or email me programming questions. Post them in the forums instead.

May 18th, 2004, 12:10 PM	#5
Pizentios Programming Guru Join Date: May 2004 Location: Brandon, Manitoba, Canada Posts: 2,023 Rep Power: 7	Thanks for the help. I don't ever remember using that in c++. oh, well it works so i an't going to complain. Thanks once again. -Pizentios __________________ Profanity is the one language that all programmers understand. Check out my Blog <---updated Nov 30 2007!

May 18th, 2004, 12:14 PM	#6
big_k105 PFO Founder Join Date: Mar 2004 Location: Fargo, ND Posts: 1,630 Rep Power: 10	no problem i love to help. even when i dont know the language __________________ BIG K aka Kyle Programming Forums Kyle K Online Please do not PM or email me programming questions. Post them in the forums instead.

May 18th, 2004, 4:27 PM	#7
lordnothing Newbie Join Date: Apr 2004 Location: ~/ Posts: 8 Rep Power: 0	the "using namespace std;" line is part of the C++ standard... the old way is still seen, but very much deprecated... you should pick up a book on standard C++ just to get up to speed on what they've adopted/changed/added to C++ during the standardization process. __________________ int main{ int count; for(count=0;count<99;count++){ printf("I will not throw paper airplanes.\n");} }

May 18th, 2004, 4:59 PM	#8
Pizentios Programming Guru Join Date: May 2004 Location: Brandon, Manitoba, Canada Posts: 2,023 Rep Power: 7	cool, i didn't know that. thanks for the info. know any good sites with this info on them? Just so i don't have to spend money. __________________ Profanity is the one language that all programmers understand. Check out my Blog <---updated Nov 30 2007!

May 20th, 2004, 6:41 PM	#9
lordnothing Newbie Join Date: Apr 2004 Location: ~/ Posts: 8 Rep Power: 0	not off the top of my head... i got that from Herbert Schildt's "Teach Yourself C++" __________________ int main{ int count; for(count=0;count<99;count++){ printf("I will not throw paper airplanes.\n");} }

Jun 14th, 2004, 6:04 AM	#10
Stormhawk Newbie Join Date: Jun 2004 Location: Nottingham, England, UK Posts: 2 Rep Power: 0	I'd recommend Bjarne Stroustrup's "The C++ Programming Language, 3rd Edition" for an in-depth, up-to-date and comprehensive guide to C++. I used it both to learn the advanced features (I already knew the basics of C++ before buying that book) and as a reference to any part of the language you care to mention. It contains a few chapters on the STL containers and algorithms, with a more indepth look at strings and streams. In all, a very useful book. http://www.amazon.com/exec/obidos/tg/detai...=glance&s=books __________________ Andrew J. Bennieston Founder, http://www.bytekill.net

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Programming Forums > Application Development > C++

Kinda stupid question.