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Insomniac · May 29th, 2005, 10:50 AM

std::cout and cout?

Im using Orielly's book and he's using Borland, but Im using DevCpp. Borland won't properly download for some reason... and I like DevCpp.

'std::cout' doesn't work in Dev, and when I change it to simply 'cout', it also doesn't work.

Here's the one the book wants me to use:

(Toggle Plain Text)

  #include <iostream>
 int main() 
 {
     std::cout << "Hello World\n";
     return (o);
 }

DevCpp highlights the std::cout line and says down below "'cout' is not a member of 'std'".

Here is one from Dev itself and as you can see, it likes 'cout':

(Toggle Plain Text)

 #include <iostream>
 
 using namespace std;
 
 int main (int argc, char *argv[])
 { 
     char quit;  
 
     quit = '\0';
     while (quit != 'q')
     {
         cout << "Hello ! This is a console app." << endl;
         cout << "To create a console, go to Project Options and select" << endl;
         cout << "\'Win32 Console\'." << endl;
         cout << "Press q to quit " << endl;
         cin >> quit;
     }
 
     return 0;
 }

I welcome your insight.

bl00dninja · May 29th, 2005, 10:54 AM

C++ has something called namespaces, and cout belongs to the std library. so you have to either say std::cout explicitly every time you use it, or you have to put the statement

using namespace std;

at the top of your code. you'll see the double-colon used when you get into classes and such. i know, that problem was a bitch for me at one time as well.

and as for it coming out bad we have tags for code as such

we also have quote tags too

Insomniac · May 29th, 2005, 11:24 AM

thank you ninja,

edit: Got it.

Insomniac · May 29th, 2005, 3:17 PM

I hate to ask this because I once found the answer to it.. and now I can't after doing a search.

After compiling and executing the program the window doesn't stay open. Any suggestions? I tried the system("PAUSE"); line.. but it did nothing that I could see.

(Toggle Plain Text)

 #include <iostream>
 
 using namespace std;
 
 int main() 
 {
     cout << "Hello World\n";
     return 0;
 }

Chris Weimer · May 29th, 2005, 4:18 PM

it's because you have to include <cstdlib> for system("PAUSE"); also you can do cin.get();

Insomniac · May 29th, 2005, 5:31 PM

Thanks Chris,

where do I put that? I tried cin.get(); in two different places that I thought were right:

(Toggle Plain Text)

 #include <iostream>
 
 using namespace std;
 
 int main() 
 {
     cout << "Hello World\n"; //prints "Hello World" on the screen
     return 0;
 }
 cin.get();

AND

(Toggle Plain Text)

 #include <iostream>
 
 using namespace std;
 
 int main() 
 {
     cout << "Hello World\n"; //prints "Hello World" on the screen
     return 0;
     cin.get();
 }

The book makes no reference to that line at all. :o

Berto · May 29th, 2005, 5:35 PM

the second one should be correct and it probably makes no refernce to it as well they dont want to over complicate things.

Insomniac · May 29th, 2005, 5:40 PM

Quote:

Originally Posted by Berto

the second one should be correct and it probably makes no refernce to it as well they dont want to over complicate things.

Thank you Berto, but unfortunately, neither keep the window open

Insomniac · May 29th, 2005, 7:04 PM

With a little extra searching I found what works.

getchar();

immediately following the cout statement. Yea!

Ok, now to the understanding part.. what is this line saying exactly? 'get character' and somehow it waits for user input?

Kami · May 29th, 2005, 7:16 PM

Quote:

Originally Posted by Insomniac

Thanks Chris,

where do I put that? I tried cin.get(); in two different places that I thought were right:

#include <iostream>

using namespace std;

int main()
{
cout << "Hello World\n"; //prints "Hello World" on the screen
return 0;
}
cin.get();

AND

#include <iostream>

using namespace std;

int main()
{
cout << "Hello World\n"; //prints "Hello World" on the screen
return 0;
cin.get();
}

The book makes no reference to that line at all.

Actually, neither of those are correct. As soon as the code encounters the return, the function exits. cin.get() is never executed. The correct code would be as follows:

int main()
{
cout << "Hello World\n"; //prints "Hello World" on the screen
cin.get(); //Wait for user input
return 0; //Exits funciton
}

May 29th, 2005, 10:50 AM	#1
Insomniac Programmer Join Date: Aug 2004 Location: Cloud #9 Posts: 47 Rep Power: 0	What is the difference between... (hello world-noob) std::cout and cout? Im using Orielly's book and he's using Borland, but Im using DevCpp. Borland won't properly download for some reason... and I like DevCpp. 'std::cout' doesn't work in Dev, and when I change it to simply 'cout', it also doesn't work. Here's the one the book wants me to use: (Toggle Plain Text) #include <iostream> int main() { std::cout << "Hello World\n"; return (o); } #include <iostream> int main() { std::cout << "Hello World\n"; return (o); } DevCpp highlights the std::cout line and says down below "'cout' is not a member of 'std'". Here is one from Dev itself and as you can see, it likes 'cout': (Toggle Plain Text) #include <iostream> using namespace std; int main (int argc, char argv[]) { char quit; quit = '\0'; while (quit != 'q') { cout << "Hello ! This is a console app." << endl; cout << "To create a console, go to Project Options and select" << endl; cout << "\'Win32 Console\'." << endl; cout << "Press q to quit " << endl; cin >> quit; } return 0; } #include <iostream> using namespace std; int main (int argc, char argv[]) { char quit; quit = '\0'; while (quit != 'q') { cout << "Hello ! This is a console app." << endl; cout << "To create a console, go to Project Options and select" << endl; cout << "\'Win32 Console\'." << endl; cout << "Press q to quit " << endl; cin >> quit; } return 0; } I welcome your insight. Last edited by Insomniac; May 30th, 2005 at 3:47 AM.

May 29th, 2005, 10:54 AM	#2
bl00dninja Programming Guru Join Date: Oct 2004 Location: namespace std Posts: 1,246 Rep Power: 6	C++ has something called namespaces, and cout belongs to the std library. so you have to either say std::cout explicitly every time you use it, or you have to put the statement using namespace std; at the top of your code. you'll see the double-colon used when you get into classes and such. i know, that problem was a bitch for me at one time as well. and as for it coming out bad we have tags for code as such we also have quote tags too __________________ i put on my robe and wizard hat... Have you ever heard of Plato, Aristotle, Socrates?...Morons.

May 29th, 2005, 11:24 AM	#3
Insomniac Programmer Join Date: Aug 2004 Location: Cloud #9 Posts: 47 Rep Power: 0	thank you ninja, edit: Got it. __________________ From an IBM Thinkpad T43 - 14.1" SXGA+ - ATI 64 MB X300 - Sonoma 760 - 2 GB RAM - 80 GB HD 5400 - IBM ABG II - FC3, Ubuntu & XPee DevC++, and Macromedia's - Dreamweaver & Flash Pro and a little Adobe Illustrator & Photoshop Sleep? Sleep is for the weak.:cool: Last edited by Insomniac; May 29th, 2005 at 3:20 PM.

May 29th, 2005, 3:17 PM	#4
Insomniac Programmer Join Date: Aug 2004 Location: Cloud #9 Posts: 47 Rep Power: 0	I hate to ask this because I once found the answer to it.. and now I can't after doing a search. After compiling and executing the program the window doesn't stay open. Any suggestions? I tried the system("PAUSE"); line.. but it did nothing that I could see. (Toggle Plain Text) #include <iostream> using namespace std; int main() { cout << "Hello World\n"; return 0; } #include <iostream> using namespace std; int main() { cout << "Hello World\n"; return 0; } __________________ From an IBM Thinkpad T43 - 14.1" SXGA+ - ATI 64 MB X300 - Sonoma 760 - 2 GB RAM - 80 GB HD 5400 - IBM ABG II - FC3, Ubuntu & XPee DevC++, and Macromedia's - Dreamweaver & Flash Pro and a little Adobe Illustrator & Photoshop Sleep? Sleep is for the weak.:cool: Last edited by Insomniac; May 30th, 2005 at 3:49 AM.

May 29th, 2005, 5:31 PM	#6
Insomniac Programmer Join Date: Aug 2004 Location: Cloud #9 Posts: 47 Rep Power: 0	Thanks Chris, where do I put that? I tried cin.get(); in two different places that I thought were right: (Toggle Plain Text) #include <iostream> using namespace std; int main() { cout << "Hello World\n"; //prints "Hello World" on the screen return 0; } cin.get(); #include <iostream> using namespace std; int main() { cout << "Hello World\n"; //prints "Hello World" on the screen return 0; } cin.get(); AND (Toggle Plain Text) #include <iostream> using namespace std; int main() { cout << "Hello World\n"; //prints "Hello World" on the screen return 0; cin.get(); } #include <iostream> using namespace std; int main() { cout << "Hello World\n"; //prints "Hello World" on the screen return 0; cin.get(); } The book makes no reference to that line at all. :o __________________ From an IBM Thinkpad T43 - 14.1" SXGA+ - ATI 64 MB X300 - Sonoma 760 - 2 GB RAM - 80 GB HD 5400 - IBM ABG II - FC3, Ubuntu & XPee DevC++, and Macromedia's - Dreamweaver & Flash Pro and a little Adobe Illustrator & Photoshop Sleep? Sleep is for the weak.:cool: Last edited by Insomniac; May 30th, 2005 at 3:50 AM.

May 29th, 2005, 4:18 PM	#5
Chris Weimer Programmer Join Date: May 2005 Posts: 34 Rep Power: 0	it's because you have to include <cstdlib> for system("PAUSE"); also you can do cin.get();

May 29th, 2005, 5:35 PM	#7
Berto Programming Guru Join Date: Aug 2004 Posts: 1,022 Rep Power: 6	the second one should be correct and it probably makes no refernce to it as well they dont want to over complicate things. __________________ "Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. THAT'S relativity." - Albert Einstein

May 29th, 2005, 7:04 PM	#9
Insomniac Programmer Join Date: Aug 2004 Location: Cloud #9 Posts: 47 Rep Power: 0	With a little extra searching I found what works. getchar(); immediately following the cout statement. Yea! Ok, now to the understanding part.. what is this line saying exactly? 'get character' and somehow it waits for user input? __________________ From an IBM Thinkpad T43 - 14.1" SXGA+ - ATI 64 MB X300 - Sonoma 760 - 2 GB RAM - 80 GB HD 5400 - IBM ABG II - FC3, Ubuntu & XPee DevC++, and Macromedia's - Dreamweaver & Flash Pro and a little Adobe Illustrator & Photoshop Sleep? Sleep is for the weak.:cool: Last edited by Insomniac; May 30th, 2005 at 3:52 AM.

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Programming Forums > Application Development > C++

What is the difference between... (hello world-noob)