C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  stoopid begineer with a question Goto page 1, 2  Next          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message knilges Guest Posted: Wed Jan 18, 2006 3:53 pm    Post subject: stoopid begineer with a question I am trying to build a Hello World program in C++. I am using the c++ or g++ complier in cygwin. My mangled code looks like this, #include <iostream> int main () { cout << "Hello World"; return; } It looks like my example but it isn't working. the compiler for g++ tells me the following: hellotest.cpp: In function `int main()': hellotest.cpp:5: error: `cout' undeclared (first use this function) hellotest.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.) hellotest.cpp:6: error: return-statement with no value, in function returning 'int' When I run it with an older complier Borland 4.5 it tells me that it can't read the input file helloworld.rc. What am I doing wrong? Back to top roberts.noah@gmail.com Guest Posted: Wed Jan 18, 2006 3:57 pm    Post subject: Re: stoopid begineer with a question knilges wrote: Quote: I am trying to build a Hello World program in C++. I am using the c++ or g++ complier in cygwin. My mangled code looks like this, #include int main () { cout << "Hello World"; return; } int main() { std::cout << "Hello World" << std::endl; return 0; } Quote: It looks like my example but it isn't working. the compiler for g++ tells me the following: hellotest.cpp: In function `int main()': hellotest.cpp:5: error: `cout' undeclared (first use this function) hellotest.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.) hellotest.cpp:6: error: return-statement with no value, in function returning 'int' When I run it with an older complier Borland 4.5 it tells me that it can't read the input file helloworld.rc. That is some sort of compiler dependent file. Quote: What am I doing wrong? Back to top Thomas Tutone Guest Posted: Wed Jan 18, 2006 3:59 pm    Post subject: Re: stoopid begineer with a question knilges wrote: Quote: I am trying to build a Hello World program in C++. I am using the c++ or g++ complier in cygwin. My mangled code looks like this, #include int main () { cout << "Hello World"; replace the above line with: std::cout << "Hello World"; and your program will compile fine. Quote: return; Delete the above line entirely, or replace it with: return 0; Quote: } Best regards, Tom Back to top Mike Smith Guest Posted: Wed Jan 18, 2006 4:32 pm    Post subject: Re: stoopid begineer with a question [email]roberts.noah (AT) gmail (DOT) com[/email] wrote: Quote: knilges wrote: I am trying to build a Hello World program in C++. I am using the c++ or g++ complier in cygwin. My mangled code looks like this, #include int main () { cout << "Hello World"; return; } int main() { std::cout << "Hello World" << std::endl; return 0; } Or just leave out the return - a main() with no return is assumed to return EXIT_SUCCESS. -- Mike Smith Back to top David Harmon Guest Posted: Wed Jan 18, 2006 5:42 pm    Post subject: Re: stoopid begineer with a question On 18 Jan 2006 07:57:58 -0800 in comp.lang.c++, [email]roberts.noah (AT) gmail (DOT) com[/email] wrote, Quote: std::cout << "Hello World" << std::endl; endl is uncalled for there. Please don't teach bad habits. If you want to add a newline, it should be: std::cout << "Hello Worldn"; Back to top roberts.noah@gmail.com Guest Posted: Wed Jan 18, 2006 6:20 pm    Post subject: Re: stoopid begineer with a question David Harmon wrote: Quote: On 18 Jan 2006 07:57:58 -0800 in comp.lang.c++, [email]roberts.noah (AT) gmail (DOT) com[/email] wrote, std::cout << "Hello World" << std::endl; endl is uncalled for there. Please don't teach bad habits. If you want to add a newline, it should be: std::cout << "Hello Worldn"; Since std::cout may very well be buffered it is actually prudent to pass std::endl instead of 'n'. In this *particular* case, since the program exits immediately following the operation it is "unneccisary" but it is a GOOD habit to get into since in anything more complex than a hello world program is going to do more and you should flush your outputs when you want them to be sent. So, to each his own. I'll answer questions the way I see fit and people can learn, or not, what they want. Thanks anyway. Back to top Mike Wahler Guest Posted: Wed Jan 18, 2006 6:45 pm    Post subject: Re: stoopid begineer with a question <roberts.noah (AT) gmail (DOT) com> wrote Quote: David Harmon wrote: On 18 Jan 2006 07:57:58 -0800 in comp.lang.c++, [email]roberts.noah (AT) gmail (DOT) com[/email] wrote, std::cout << "Hello World" << std::endl; endl is uncalled for there. Please don't teach bad habits. If you want to add a newline, it should be: std::cout << "Hello Worldn"; Since std::cout may very well be buffered it is actually prudent to pass std::endl instead of 'n'. In this *particular* case, since the program exits immediately following the operation it is "unneccisary" but it is a GOOD habit IMO a 'good' habit would be something that is always 'good' in general (e.g. use consistent indentation style). But imo 'proper' use of 'endl' depends much upon context. Because of what it does, using it needlessly can unnecessarily degrade performance. (i/o is typically the slowest part of a system -- that's why buffering was invented). Quote: to get into since in anything more complex than a hello world program is going to do more and you should flush your outputs when you want them to be sent. But it's often the case that 'visible' output is not needed at every occurence of 'n'. Quote: So, to each his own. I'll answer questions the way I see fit and people can learn, or not, what they want. And others will insert their opinions as they see fit. :-) FWIW I've still never had the need to use 'endl' with output streams. -Mike Back to top roberts.noah@gmail.com Guest Posted: Wed Jan 18, 2006 6:51 pm    Post subject: Re: stoopid begineer with a question Mike Wahler wrote: Quote: roberts.noah (AT) gmail (DOT) com> wrote in message news:1137608448.846583.265250 (AT) g14g2000cwa (DOT) googlegroups.com... David Harmon wrote: On 18 Jan 2006 07:57:58 -0800 in comp.lang.c++, [email]roberts.noah (AT) gmail (DOT) com[/email] wrote, std::cout << "Hello World" << std::endl; endl is uncalled for there. Please don't teach bad habits. So, to each his own. I'll answer questions the way I see fit and people can learn, or not, what they want. And others will insert their opinions as they see fit. Well it seems some people feel I need permission to do so. Back to top roberts.noah@gmail.com Guest Posted: Wed Jan 18, 2006 6:52 pm    Post subject: Re: stoopid begineer with a question Mike Wahler wrote: Quote: roberts.noah (AT) gmail (DOT) com> wrote in message news:1137608448.846583.265250 (AT) g14g2000cwa (DOT) googlegroups.com... David Harmon wrote: On 18 Jan 2006 07:57:58 -0800 in comp.lang.c++, [email]roberts.noah (AT) gmail (DOT) com[/email] wrote, std::cout << "Hello World" << std::endl; endl is uncalled for there. Please don't teach bad habits. So, to each his own. I'll answer questions the way I see fit and people can learn, or not, what they want. And others will insert their opinions as they see fit. Well it seems some people feel I need permission to do so. Back to top Mike Wahler Guest Posted: Wed Jan 18, 2006 11:29 pm    Post subject: Re: stoopid begineer with a question <roberts.noah (AT) gmail (DOT) com> wrote Quote: Mike Wahler wrote: [email]roberts.noah (AT) gmail (DOT) com[/email]> wrote in message news:1137608448.846583.265250 (AT) g14g2000cwa (DOT) googlegroups.com... David Harmon wrote: On 18 Jan 2006 07:57:58 -0800 in comp.lang.c++, [email]roberts.noah (AT) gmail (DOT) com[/email] wrote, std::cout << "Hello World" << std::endl; endl is uncalled for there. Please don't teach bad habits. So, to each his own. I'll answer questions the way I see fit and people can learn, or not, what they want. And others will insert their opinions as they see fit. :-) Well it seems some people feel I need permission to do so. Really? I haven't seen any indication of that. If someone responds to your post with e.g. "don't say that", that simply means they disagree, not that they're demanding you ask permission to say it. (Civilly expressed) disagreements often lead to useful discussion. Discussion sheds light on both sides of an issue, and allows observers to draw their own conclusions. I think that is especially useful for the novice. -Mike Back to top knilges Guest Posted: Thu Jan 19, 2006 2:08 am    Post subject: Re: stoopid begineer with a question You guys must drink a lot of coffee!!! Whoa! LOL! "Mike Wahler" <mkwahler (AT) mkwahler (DOT) net> wrote Quote: roberts.noah (AT) gmail (DOT) com> wrote in message news:1137610321.710877.315490 (AT) g49g2000cwa (DOT) googlegroups.com... Mike Wahler wrote: [email]roberts.noah (AT) gmail (DOT) com[/email]> wrote in message news:1137608448.846583.265250 (AT) g14g2000cwa (DOT) googlegroups.com... David Harmon wrote: On 18 Jan 2006 07:57:58 -0800 in comp.lang.c++, [email]roberts.noah (AT) gmail (DOT) com[/email] wrote, std::cout << "Hello World" << std::endl; endl is uncalled for there. Please don't teach bad habits. So, to each his own. I'll answer questions the way I see fit and people can learn, or not, what they want. And others will insert their opinions as they see fit. :-) Well it seems some people feel I need permission to do so. Really? I haven't seen any indication of that. If someone responds to your post with e.g. "don't say that", that simply means they disagree, not that they're demanding you ask permission to say it. (Civilly expressed) disagreements often lead to useful discussion. Discussion sheds light on both sides of an issue, and allows observers to draw their own conclusions. I think that is especially useful for the novice. -Mike Back to top Geo Guest Posted: Fri Jan 27, 2006 10:12 am    Post subject: Re: stoopid begineer with a question adrian suri wrote: Quote: hi Hi try this instead, you missed out the name space declaration //hello.cpp #include using namespace std; Argh... no don't do this see the FAQ http://www.parashift.com/c++-faq-lite/coding-standards.html#faq-27.5 Quote: int main () { cout << "Hello World" < return 0; } compiles fine under watcom 1.4 under OS/2 4.52 regards Adrian knilges wrote: I am trying to build a Hello World program in C++. I am using the c++ or g++ complier in cygwin. My mangled code looks like this, #include int main () { cout << "Hello World"; return; } It looks like my example but it isn't working. the compiler for g++ tells me the following: hellotest.cpp: In function `int main()': hellotest.cpp:5: error: `cout' undeclared (first use this function) hellotest.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.) hellotest.cpp:6: error: return-statement with no value, in function returning 'int' When I run it with an older complier Borland 4.5 it tells me that it can't read the input file helloworld.rc. What am I doing wrong? Back to top Daniel T. Guest Posted: Fri Jan 27, 2006 12:34 pm    Post subject: Re: stoopid begineer with a question In article <1138356771.902259.232600 (AT) g44g2000cwa (DOT) googlegroups.com>, "Geo" <gg (AT) remm (DOT) org> wrote: Quote: try this instead, you missed out the name space declaration //hello.cpp #include using namespace std; Argh... no don't do this see the FAQ http://www.parashift.com/c++-faq-lite/coding-standards.html#faq-27.5 As I recall, Herb Sutter disagrees with the faq on this point. Back to top Geo Guest Posted: Fri Jan 27, 2006 12:42 pm    Post subject: Re: stoopid begineer with a question Daniel T. wrote: Quote: In article <1138356771.902259.232600 (AT) g44g2000cwa (DOT) googlegroups.com>, "Geo" <gg (AT) remm (DOT) org> wrote: try this instead, you missed out the name space declaration //hello.cpp #include using namespace std; Argh... no don't do this see the FAQ http://www.parashift.com/c++-faq-lite/coding-standards.html#faq-27.5 As I recall, Herb Sutter disagrees with the faq on this point. Well that's Herb's choice, but I think I'll go with the concensus opinion of he FAQ on this one YMMV. Back to top Gavin Deane Guest Posted: Fri Jan 27, 2006 2:37 pm    Post subject: Re: stoopid begineer with a question Daniel T. wrote: Quote: In article <1138356771.902259.232600 (AT) g44g2000cwa (DOT) googlegroups.com>, "Geo" <gg (AT) remm (DOT) org> wrote: try this instead, you missed out the name space declaration //hello.cpp #include using namespace std; Argh... no don't do this see the FAQ http://www.parashift.com/c++-faq-lite/coding-standards.html#faq-27.5 As I recall, Herb Sutter disagrees with the faq on this point. Can you cite any reference for that? An online source or a book? I'd be quite surprised to see Herb Sutter generally recommending using directives (as opposed to using declarations). If he does disagree with the FAQ I would be interested to read about it. 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